diff --git a/.circleci/config.yml b/.circleci/config.yml
index 3f59d9481..4529184df 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -46,6 +46,10 @@ jobs:
           name: Lint
           command: yarn run lint
 
+      - run:
+          name: Locale
+          command: yarn run locale:verify
+
       - run:
           name: Unit tests
           command: |
diff --git a/apis/nucleus/src/components/LongRunningQuery.jsx b/apis/nucleus/src/components/LongRunningQuery.jsx
index 5e2da3090..d4062ddd0 100644
--- a/apis/nucleus/src/components/LongRunningQuery.jsx
+++ b/apis/nucleus/src/components/LongRunningQuery.jsx
@@ -1,7 +1,8 @@
 /* eslint-disable react/jsx-props-no-spreading */
-import React, { useState } from 'react';
+import React, { useState, useContext } from 'react';
 import { makeStyles, Grid, Typography, Button } from '@material-ui/core';
 import WarningTriangle from '@nebula.js/ui/icons/warning-triangle-2';
+import LocaleContext from '../contexts/LocaleContext';
 
 import Progress from './Progress';
 
@@ -22,7 +23,7 @@ const useStyles = makeStyles(() => ({
   },
 }));
 
-const Cancel = ({ cancel, ...props }) => (
+const Cancel = ({ cancel, translator, ...props }) => (
   <>
     <Grid container item direction="column" alignItems="center" spacing={2}>
       <Grid item>
@@ -30,19 +31,19 @@ const Cancel = ({ cancel, ...props }) => (
       </Grid>
       <Grid item>
         <Typography variant="h6" align="center">
-          Updating data
+          {translator.get('Object.Update.Active')}
         </Typography>
       </Grid>
     </Grid>
     <Grid item {...props}>
       <Button variant="contained" onClick={cancel}>
-        Cancel
+        {translator.get('Common.Cancel')}
       </Button>
     </Grid>
   </>
 );
 
-const Retry = ({ retry, ...props }) => (
+const Retry = ({ retry, translator, ...props }) => (
   <>
     <Grid item>
       <WarningTriangle style={{ fontSize: '38px' }} />
@@ -50,11 +51,12 @@ const Retry = ({ retry, ...props }) => (
     <Grid item>
       <Typography variant="h6" align="center">
         Data update was cancelled
+        {translator.get('Object.Update.Cancelled')}
       </Typography>
     </Grid>
     <Grid item>
       <Button variant="contained" onClick={retry} {...props}>
-        Retry
+        {translator.get('Common.Retry')}
       </Button>
     </Grid>
   </>
@@ -64,6 +66,8 @@ export default function LongRunningQuery({ onCancel, onRetry }) {
   const { stripes, cancel, retry } = useStyles();
   const [canCancel, setCanCancel] = useState(!!onCancel);
   const [canRetry, setCanRetry] = useState(!!onRetry);
+  const translator = useContext(LocaleContext);
+
   const handleCancel = () => {
     setCanCancel(false);
     setCanRetry(true);
@@ -90,8 +94,8 @@ export default function LongRunningQuery({ onCancel, onRetry }) {
       }}
       spacing={2}
     >
-      {canCancel && <Cancel cancel={handleCancel} className={cancel} />}
-      {canRetry && <Retry retry={handleRetry} className={retry} />}
+      {canCancel && <Cancel cancel={handleCancel} translator={translator} className={cancel} />}
+      {canRetry && <Retry retry={handleRetry} translator={translator} className={retry} />}
     </Grid>
   );
 }
diff --git a/apis/nucleus/src/components/selections/OneField.jsx b/apis/nucleus/src/components/selections/OneField.jsx
index e120d6db9..d6894ffd6 100644
--- a/apis/nucleus/src/components/selections/OneField.jsx
+++ b/apis/nucleus/src/components/selections/OneField.jsx
@@ -61,8 +61,6 @@ export default function OneField({ field, api, stateIx = 0, skipHandleShowListBo
     label = translator.get('CurrentSelections.All');
   } else if (numSelected > 1 && selection.qTotal) {
     label = translator.get('CurrentSelections.Of', [numSelected, selection.qTotal]);
-  } else if (noSegments) {
-    label = translator.get('CurrentSelections.None');
   } else {
     label = selection.qSelectedFieldSelectionInfo.map(v => v.qName).join(', ');
   }
diff --git a/apis/nucleus/src/components/selections/__tests__/one-field.spec.jsx b/apis/nucleus/src/components/selections/__tests__/one-field.spec.jsx
index cec2a3f46..71b8cdb34 100644
--- a/apis/nucleus/src/components/selections/__tests__/one-field.spec.jsx
+++ b/apis/nucleus/src/components/selections/__tests__/one-field.spec.jsx
@@ -91,6 +91,7 @@ describe('<OneField />', () => {
       selections: [
         {
           qField: 'my-field',
+          qSelectedFieldSelectionInfo: [],
         },
       ],
       states: ['$'],
@@ -111,6 +112,7 @@ describe('<OneField />', () => {
         {
           qField: 'my-field',
           qLocked: true,
+          qSelectedFieldSelectionInfo: [],
         },
       ],
       states: ['$'],
diff --git a/apis/nucleus/src/locale/app-locale.js b/apis/nucleus/src/locale/app-locale.js
index 2cba7be85..4915ecc4e 100644
--- a/apis/nucleus/src/locale/app-locale.js
+++ b/apis/nucleus/src/locale/app-locale.js
@@ -1,18 +1,13 @@
 import localeFn from '@nebula.js/locale';
-import en from './translations/en-US';
+import all from './translations/all.json';
 
 export default function appLocaleFn({ language }) {
   const l = localeFn({
     initial: language,
   });
 
-  Object.keys(en).forEach(id => {
-    l.translator.add({
-      id,
-      locale: {
-        'en-US': en[id],
-      },
-    });
+  Object.keys(all).forEach(key => {
+    l.translator.add(all[key]);
   });
 
   return {
diff --git a/apis/nucleus/src/locale/translations/all.json b/apis/nucleus/src/locale/translations/all.json
new file mode 100644
index 000000000..6d063fbe9
--- /dev/null
+++ b/apis/nucleus/src/locale/translations/all.json
@@ -0,0 +1,394 @@
+{
+  "Object_Update_Active": {
+    "id": "Object.Update.Active",
+    "locale": {
+      "en-US": "Updating data"
+    }
+  },
+  "Object_Update_Cancelled": {
+    "id": "Object.Update.Cancelled",
+    "locale": {
+      "en-US": "Data update was cancelled"
+    }
+  },
+  "Supernova_Incomplete": {
+    "id": "Supernova.Incomplete",
+    "locale": {
+      "en-US": "Incomplete visualization",
+      "it-IT": "Visualizzazione incompleta",
+      "zh-CN": "不完整的可视化",
+      "zh-TW": "視覺化未完成",
+      "ko-KR": "완료되지 않은 시각화",
+      "de-DE": "Unvollständige Visualisierung",
+      "sv-SE": "Ofullständig visualisering",
+      "es-ES": "Visualización incompleta",
+      "pt-BR": "Visualização incompleta",
+      "ja-JP": "未完了のビジュアライゼーション",
+      "fr-FR": "Visualisation incomplète",
+      "nl-NL": "Onvolledige visualisatie",
+      "tr-TR": "Tamamlanmamış görselleştirme",
+      "pl-PL": "Niekompletna wizualizacja",
+      "ru-RU": "Незавершенная визуализация"
+    }
+  },
+  "Cancel": {
+    "id": "Common.Cancel",
+    "locale": {
+      "en-US": "Cancel",
+      "de-DE": "Abbrechen",
+      "es-ES": "Cancelar",
+      "fr-FR": "Annuler",
+      "ja-JP": "キャンセル",
+      "nl-NL": "Annuleren",
+      "it-IT": "Annulla",
+      "ko-KR": "취소",
+      "pl-PL": "Anuluj",
+      "ru-RU": "Отмена",
+      "pt-BR": "Cancelar",
+      "sv-SE": "Avbryt",
+      "zh-CN": "取消",
+      "tr-TR": "İptal",
+      "zh-TW": "取消"
+    }
+  },
+  "OK": {
+    "id": "Common.OK",
+    "locale": {
+      "en-US": "OK",
+      "de-DE": "OK",
+      "es-ES": "Aceptar",
+      "fr-FR": "OK",
+      "ja-JP": "OK",
+      "nl-NL": "OK",
+      "it-IT": "OK",
+      "ko-KR": "확인",
+      "pl-PL": "OK",
+      "ru-RU": "ОК",
+      "pt-BR": "OK",
+      "sv-SE": "OK",
+      "zh-CN": "确定",
+      "tr-TR": "Tamam",
+      "zh-TW": "確定"
+    }
+  },
+  "Retry": {
+    "id": "Common.Retry",
+    "locale": {
+      "en-US": "Retry",
+      "it-IT": "Riprova",
+      "zh-CN": "重试",
+      "zh-TW": "重試",
+      "ko-KR": "다시 시도",
+      "de-DE": "Wiederholen",
+      "sv-SE": "Försök igen",
+      "es-ES": "Intentar de nuevo",
+      "pt-BR": "Tentar Novamente",
+      "ja-JP": "再試行",
+      "fr-FR": "Réessayer",
+      "nl-NL": "Opnieuw",
+      "tr-TR": "Yeniden dene",
+      "pl-PL": "Ponów próbę",
+      "ru-RU": "Повторить попытку"
+    }
+  },
+  "CurrentSelections_All": {
+    "id": "CurrentSelections.All",
+    "locale": {
+      "en-US": "ALL",
+      "it-IT": "TUTTO",
+      "zh-CN": "全部",
+      "zh-TW": "全部",
+      "ko-KR": "모두",
+      "de-DE": "ALLES",
+      "sv-SE": "ALLA",
+      "es-ES": "TODOS",
+      "pt-BR": "TODOS",
+      "ja-JP": "すべて",
+      "fr-FR": "TOUS",
+      "nl-NL": "ALLE",
+      "tr-TR": "TÜMÜ",
+      "pl-PL": "WSZYSTKO",
+      "ru-RU": "ВСЕ"
+    }
+  },
+  "CurrentSelections_Of": {
+    "id": "CurrentSelections.Of",
+    "locale": {
+      "en-US": "{0} of {1}",
+      "it-IT": "{0} di {1}",
+      "zh-CN": "{0}/{1}",
+      "zh-TW": "{0} / {1}",
+      "ko-KR": "{0} / {1}",
+      "de-DE": "{0} von {1}",
+      "sv-SE": "{0} av {1}",
+      "es-ES": "{0} de {1}",
+      "pt-BR": "{0} de {1}",
+      "ja-JP": "{0} / {1}",
+      "fr-FR": "{0} sur {1}",
+      "nl-NL": "{0} van {1}",
+      "tr-TR": "{0} / {1}",
+      "pl-PL": "{0} z {1}",
+      "ru-RU": "{0} из {1}"
+    }
+  },
+  "Listbox_Search": {
+    "id": "Listbox.Search",
+    "locale": {
+      "en-US": "Search in listbox",
+      "it-IT": "Cerca nella casella di elenco",
+      "zh-CN": "在列表框中搜索",
+      "zh-TW": "在清單方塊中搜尋",
+      "ko-KR": "목록 상자에서 검색",
+      "de-DE": "In Listenfeld suchen",
+      "sv-SE": "Sök i listruta",
+      "es-ES": "Buscar en cuadro de lista",
+      "pt-BR": "Pesquisar na caixa de listagem",
+      "ja-JP": "リストボックス内を検索",
+      "fr-FR": "Rechercher dans la liste de sélection",
+      "nl-NL": "Zoeken in keuzelijst",
+      "tr-TR": "Liste kutusunda ara",
+      "pl-PL": "Wyszukaj w liście wartości",
+      "ru-RU": "Поиск в списке"
+    }
+  },
+  "Navigate_Forward": {
+    "id": "Navigate.Forward",
+    "locale": {
+      "en-US": "Step forward",
+      "it-IT": "Vai avanti",
+      "zh-CN": "前进",
+      "zh-TW": "前進",
+      "ko-KR": "다음 단계",
+      "de-DE": "Schritt vor",
+      "sv-SE": "Gå framåt",
+      "es-ES": "Avanzar",
+      "pt-BR": "Avançar uma etapa",
+      "ja-JP": "1段階進む",
+      "fr-FR": "Étape suivante",
+      "nl-NL": "Stap vooruit",
+      "tr-TR": "Bir adım ileri",
+      "pl-PL": "Krok do przodu",
+      "ru-RU": "Шаг вперед"
+    }
+  },
+  "Navigate_Back": {
+    "id": "Navigate.Back",
+    "locale": {
+      "en-US": "Step back",
+      "it-IT": "Torna indietro",
+      "zh-CN": "后退",
+      "zh-TW": "倒退",
+      "ko-KR": "이전 단계",
+      "de-DE": "Schritt zurück",
+      "sv-SE": "Gå bakåt",
+      "es-ES": "Retroceder",
+      "pt-BR": "Voltar uma etapa",
+      "ja-JP": "1 段階戻る",
+      "fr-FR": "Retour en arrière",
+      "nl-NL": "Stap terug",
+      "tr-TR": "Bir adım geri",
+      "pl-PL": "Krok do tyłu",
+      "ru-RU": "Шаг назад"
+    }
+  },
+  "Selection_ClearAll": {
+    "id": "Selection.ClearAll",
+    "locale": {
+      "en-US": "Clear all selections",
+      "it-IT": "Cancella tutte le selezioni",
+      "zh-CN": "清除所有选择项",
+      "zh-TW": "清除所有選項",
+      "ko-KR": "모든 선택 해제",
+      "de-DE": "Auswahl aufheben (alle Felder)",
+      "sv-SE": "Rensa alla urval",
+      "es-ES": "Borrar todas las selecciones",
+      "pt-BR": "Limpar todas as seleções",
+      "ja-JP": "選択をすべてクリアする",
+      "fr-FR": "Effacer toutes les sélections",
+      "nl-NL": "Alle selecties wissen",
+      "tr-TR": "Tüm seçimleri temizle",
+      "pl-PL": "Wyczyść wszystkie selekcje",
+      "ru-RU": "Очистить от всех выборок"
+    }
+  },
+  "Selection_ClearAllStates": {
+    "id": "Selection.ClearAllStates",
+    "locale": {
+      "en-US": "Clear all states",
+      "it-IT": "Cancella tutti gli stati",
+      "zh-CN": "清除所有状态",
+      "zh-TW": "清除所有狀態",
+      "ko-KR": "모든 상태 지우기",
+      "de-DE": "Alle Status löschen",
+      "sv-SE": "Rensa alla tillstånd",
+      "es-ES": "Borrar todos los estados",
+      "pt-BR": "Limpar todos os estados",
+      "ja-JP": "全ステートをクリア",
+      "fr-FR": "Effacer tous les états",
+      "nl-NL": "Alle states wissen",
+      "tr-TR": "Tüm durumları temizle",
+      "pl-PL": "Wyczyść wszystkie stany",
+      "ru-RU": "Очистить все состояния"
+    }
+  },
+  "Selection_Confirm": {
+    "id": "Selection.Confirm",
+    "locale": {
+      "en-US": "Confirm selection",
+      "it-IT": "Conferma selezione",
+      "zh-CN": "确认选择",
+      "zh-TW": "確認選取",
+      "ko-KR": "선택 확인",
+      "de-DE": "Auswahl bestätigen",
+      "sv-SE": "Bekräfta urval",
+      "es-ES": "Confirmar selección",
+      "pt-BR": "Confirmar seleção",
+      "ja-JP": "選択の確認",
+      "fr-FR": "Confirmer la sélection",
+      "nl-NL": "Selectie bevestigen",
+      "tr-TR": "Seçimi onayla",
+      "pl-PL": "Potwierdź selekcję",
+      "ru-RU": "Подтвердить выборку"
+    }
+  },
+  "Selection_Cancel": {
+    "id": "Selection.Cancel",
+    "locale": {
+      "en-US": "Cancel selection",
+      "it-IT": "Annulla selezione",
+      "zh-CN": "取消选择",
+      "zh-TW": "取消選取",
+      "ko-KR": "선택 취소",
+      "de-DE": "Auswahl abbrechen",
+      "sv-SE": "Avbryt urval",
+      "es-ES": "Cancelar selección",
+      "pt-BR": "Cancelar seleção",
+      "ja-JP": "選択のキャンセル",
+      "fr-FR": "Annuler la sélection",
+      "nl-NL": "Selectie annuleren",
+      "tr-TR": "Seçimi iptal et",
+      "pl-PL": "Anuluj selekcję",
+      "ru-RU": "Отменить выборку"
+    }
+  },
+  "Selection_Clear": {
+    "id": "Selection.Clear",
+    "locale": {
+      "en-US": "Clear selection",
+      "it-IT": "Cancella selezione",
+      "zh-CN": "清除选择",
+      "zh-TW": "清除選項",
+      "ko-KR": "선택 해제",
+      "de-DE": "Auswahl löschen",
+      "sv-SE": "Rensa urval",
+      "es-ES": "Borrar selección",
+      "pt-BR": "Limpar seleção",
+      "ja-JP": "選択をクリア",
+      "fr-FR": "Effacer la sélection",
+      "nl-NL": "Selectie wissen",
+      "tr-TR": "Seçimi temizle",
+      "pl-PL": "Wyczyść selekcję",
+      "ru-RU": "Очистить выбор"
+    }
+  },
+  "Selection_SelectAll": {
+    "id": "Selection.SelectAll",
+    "locale": {
+      "en-US": "Select all",
+      "it-IT": "Seleziona tutto",
+      "zh-CN": "全选",
+      "zh-TW": "全選",
+      "ko-KR": "모두 선택",
+      "de-DE": "Alle Werte auswählen",
+      "sv-SE": "Markera alla",
+      "es-ES": "Seleccionar todo",
+      "pt-BR": "Selecionar todos",
+      "ja-JP": "すべて選択",
+      "fr-FR": "Sélectionner tout",
+      "nl-NL": "Alles selecteren",
+      "tr-TR": "Tümünü seç",
+      "pl-PL": "Wybierz wszystko",
+      "ru-RU": "Выбрать все"
+    }
+  },
+  "Selection_SelectAlternative": {
+    "id": "Selection.SelectAlternative",
+    "locale": {
+      "en-US": "Select alternative",
+      "it-IT": "Seleziona alternativi",
+      "zh-CN": "选择替代项",
+      "zh-TW": "選取替代選項",
+      "ko-KR": "대안 선택",
+      "de-DE": "Alternative Werte auswählen",
+      "sv-SE": "Välj alternativ",
+      "es-ES": "Seleccionar alternativos",
+      "pt-BR": "Selecionar alternativa",
+      "ja-JP": "代替値を選択",
+      "fr-FR": "Sélectionner des valeurs alternatives",
+      "nl-NL": "Alternatief selecteren",
+      "tr-TR": "Alternatifi seç",
+      "pl-PL": "Wybierz alternatywę",
+      "ru-RU": "Выбрать альтернативные"
+    }
+  },
+  "Selection_SelectExcluded": {
+    "id": "Selection.SelectExcluded",
+    "locale": {
+      "en-US": "Select excluded",
+      "it-IT": "Seleziona esclusi",
+      "zh-CN": "选择排除项",
+      "zh-TW": "選取排除值",
+      "ko-KR": "제외 항목 선택",
+      "de-DE": "Ausgeschlossene Werte auswählen",
+      "sv-SE": "Välj uteslutna",
+      "es-ES": "Seleccionar excluidos",
+      "pt-BR": "Selecionar excluído",
+      "ja-JP": "除外値を選択",
+      "fr-FR": "Sélectionner les valeurs exclues",
+      "nl-NL": "Uitgesloten selecteren",
+      "tr-TR": "Hariç tutulanı seç",
+      "pl-PL": "Wybierz wykluczone",
+      "ru-RU": "Выбрать исключенные"
+    }
+  },
+  "Selection_SelectPossible": {
+    "id": "Selection.SelectPossible",
+    "locale": {
+      "en-US": "Select possible",
+      "it-IT": "Seleziona possibili",
+      "zh-CN": "选择可能值",
+      "zh-TW": "選取可能值",
+      "ko-KR": "사용 가능 항목 선택",
+      "de-DE": "Wählbare Werte auswählen",
+      "sv-SE": "Välj möjliga",
+      "es-ES": "Seleccionar posibles",
+      "pt-BR": "Selecionar possível",
+      "ja-JP": "絞込値を選択",
+      "fr-FR": "Sélectionner les valeurs possibles",
+      "nl-NL": "Mogelijke selecteren",
+      "tr-TR": "Olasıyı seç",
+      "pl-PL": "Wybierz możliwe",
+      "ru-RU": "Выбрать возможные"
+    }
+  },
+  "Selection_Menu": {
+    "id": "Selection.Menu",
+    "locale": {
+      "en-US": "Selection menu",
+      "it-IT": "Menu Selezione",
+      "zh-CN": "选择菜单",
+      "zh-TW": "選項功能表",
+      "ko-KR": "선택 메뉴",
+      "de-DE": "Auswahlmenü",
+      "sv-SE": "Urvalsmeny",
+      "es-ES": "Menú de selección",
+      "pt-BR": "Menu de seleção",
+      "ja-JP": "選択メニュー",
+      "fr-FR": "Menu Sélection",
+      "nl-NL": "Selectiemenu",
+      "tr-TR": "Seçim menüsü",
+      "pl-PL": "Menu selekcji",
+      "ru-RU": "Меню \"Выборка\""
+    }
+  }
+}
diff --git a/apis/nucleus/src/locale/translations/en-US.js b/apis/nucleus/src/locale/translations/en-US.js
deleted file mode 100644
index c7817adf2..000000000
--- a/apis/nucleus/src/locale/translations/en-US.js
+++ /dev/null
@@ -1,22 +0,0 @@
-export default {
-  'Common.Cancel': 'Cancel',
-  'Common.OK': 'Ok',
-  'Common.English': 'English',
-  'CurrentSelections.All': 'ALL',
-  'CurrentSelections.Of': '{0} of {1}',
-  'CurrentSelections.None': 'NONE',
-  'Listbox.Search': 'Search in listbox',
-  'Navigate.Forward': 'Step forward',
-  'Navigate.Back': 'Step back',
-  'Selection.ClearAll': 'Clear all selections',
-  'Selection.ClearAllStates': 'Clear all states',
-  'Selection.Confirm': 'Confirm selection',
-  'Selection.Cancel': 'Cancel selection',
-  'Selection.Clear': 'Clear selection',
-  'Selection.SelectAll': 'Select all',
-  'Selection.SelectAlternative': 'Select alternative',
-  'Selection.SelectExcluded': 'Select excluded',
-  'Selection.SelectPossible': 'Select possible',
-  'Selection.Menu': 'Selection menu',
-  'Supernova.Incomplete': 'Incomplete visualization',
-};
diff --git a/package.json b/package.json
index dfae388ce..73fa22f8b 100644
--- a/package.json
+++ b/package.json
@@ -5,6 +5,7 @@
     "build": "cross-env NODE_ENV=production FORCE_COLOR=1 lerna run build --stream",
     "build:codesandbox": "cross-env NODE_ENV=production CODESANDBOX=1 FORCE_COLOR=1 lerna run build --stream --scope \"@nebula.js/{nucleus,supernova,theme}\"",
     "build:watch": "FORCE_COLOR=1 lerna run build:watch --stream --concurrency 99 --no-sort",
+    "locale:verify": "node tools/verify-translations.js",
     "lint": "eslint packages apis commands --ext .js,.jsx",
     "lint:check": "eslint --print-config ./aw.config.js | eslint-config-prettier-check",
     "start": "MONO=true ./commands/cli/lib/index.js serve --entry ./test/integration/sn.js",
@@ -33,6 +34,7 @@
     "@after-work.js/aw": "6.0.10",
     "@babel/cli": "7.7.4",
     "@babel/core": "7.7.4",
+    "@babel/helper-plugin-utils": "^7.0.0",
     "@babel/plugin-transform-react-jsx": "7.7.4",
     "@babel/preset-env": "7.7.4",
     "@babel/preset-react": "7.7.4",
diff --git a/rollup.config.js b/rollup.config.js
index c9080aaa0..47c416803 100644
--- a/rollup.config.js
+++ b/rollup.config.js
@@ -6,6 +6,8 @@ const replace = require('rollup-plugin-replace');
 const json = require('rollup-plugin-json');
 const { terser } = require('rollup-plugin-terser');
 
+const localeStringValidator = require('./tools/locale-string-validator');
+
 const cwd = process.cwd();
 const pkg = require(path.join(cwd, 'package.json')); // eslint-disable-line
 const { name, version, license } = pkg;
@@ -150,7 +152,7 @@ const config = isEsm => {
             },
           ],
         ],
-        plugins: [['@babel/plugin-transform-react-jsx']],
+        plugins: [['@babel/plugin-transform-react-jsx'], [localeStringValidator, {}]],
       }),
     ],
   };
diff --git a/tools/locale-string-validator.js b/tools/locale-string-validator.js
new file mode 100644
index 000000000..c459ce691
--- /dev/null
+++ b/tools/locale-string-validator.js
@@ -0,0 +1,56 @@
+const { declare } = require('@babel/helper-plugin-utils');
+
+const vars = require('../apis/nucleus/src/locale/translations/all.json');
+
+const ids = {};
+Object.keys(vars).forEach(key => {
+  ids[vars[key].id] = key;
+});
+
+const used = [];
+const warnings = {};
+
+const warn = s => console.warn(`\x1b[43m\x1b[30m WARN \x1b[0m \x1b[1m\x1b[33m ${s}\x1b[0m`);
+
+const find = declare((/* api, options */) => {
+  function useString(id) {
+    if (used.indexOf(id) !== -1) {
+      return;
+    }
+
+    used.push(id);
+
+    if (typeof ids[id] === 'undefined') {
+      warn(`String '${id}' does not exist in locale registry`);
+    }
+  }
+  return {
+    name: 'find',
+    visitor: {
+      CallExpression(path) {
+        if (!path.get('callee').isMemberExpression()) {
+          return;
+        }
+        if (
+          path.node.callee.object &&
+          path.node.callee.object.name === 'translator' &&
+          path.node.callee.property &&
+          path.node.callee.property.name === 'get'
+        ) {
+          const { type, value } = path.node.arguments[0];
+          if (type === 'StringLiteral') {
+            useString(value, path);
+          } else {
+            const s = `${this.file.opts.filename}:${path.node.loc.start.line}:${path.node.loc.start.column}`;
+            if (!warnings[s]) {
+              warnings[s] = true;
+              warn(`Could not verify used string at ${s}`);
+            }
+          }
+        }
+      },
+    },
+  };
+});
+
+module.exports = find;
diff --git a/tools/verify-translations.js b/tools/verify-translations.js
new file mode 100644
index 000000000..66db0f98c
--- /dev/null
+++ b/tools/verify-translations.js
@@ -0,0 +1,32 @@
+const vars = require('../apis/nucleus/src/locale/translations/all.json');
+
+const languages = [
+  'en-US',
+  'it-IT',
+  'zh-CN',
+  'zh-TW',
+  'ko-KR',
+  'de-DE',
+  'sv-SE',
+  'es-ES',
+  'pt-BR',
+  'ja-JP',
+  'fr-FR',
+  'nl-NL',
+  'tr-TR',
+  'pl-PL',
+  'ru-RU',
+];
+
+Object.keys(vars).forEach(key => {
+  const supportLanguagesForString = Object.keys(vars[key].locale);
+  if (supportLanguagesForString.indexOf('en-US') === -1) {
+    // en-US must exist
+    throw new Error(`String '${vars[key].id}' is missing value for 'en-US'`);
+  }
+  for (let i = 0; i < languages.length; i++) {
+    if (supportLanguagesForString.indexOf(languages[i]) === -1) {
+      console.warn(`String '${vars[key].id}' is missing value for '${languages[i]}'`);
+    }
+  }
+});