diff --git a/adapter/src/components/ServerVersionProvider.js b/adapter/src/components/ServerVersionProvider.js
index 5555594fc..439ba832f 100644
--- a/adapter/src/components/ServerVersionProvider.js
+++ b/adapter/src/components/ServerVersionProvider.js
@@ -10,6 +10,7 @@ import { useOfflineInterface } from './OfflineInterfaceContext.js'
 
 export const ServerVersionProvider = ({
     appName,
+    appUrlSlug,
     appVersion,
     url, // url from env vars
     apiVersion,
@@ -210,6 +211,7 @@ export const ServerVersionProvider = ({
         <Provider
             config={{
                 appName,
+                appUrlSlug,
                 appVersion: parseVersion(appVersion),
                 baseUrl,
                 apiVersion: apiVersion || realApiVersion,
@@ -230,6 +232,7 @@ export const ServerVersionProvider = ({
 
 ServerVersionProvider.propTypes = {
     appName: PropTypes.string.isRequired,
+    appUrlSlug: PropTypes.string.isRequired,
     appVersion: PropTypes.string.isRequired,
     apiVersion: PropTypes.number,
     children: PropTypes.element,
diff --git a/adapter/src/index.js b/adapter/src/index.js
index adb3f25c9..a734eb728 100644
--- a/adapter/src/index.js
+++ b/adapter/src/index.js
@@ -10,6 +10,7 @@ import { ServerVersionProvider } from './components/ServerVersionProvider.js'
 
 const AppAdapter = ({
     appName,
+    appUrlSlug,
     appVersion,
     url,
     apiVersion,
@@ -38,6 +39,7 @@ const AppAdapter = ({
             >
                 <ServerVersionProvider
                     appName={appName}
+                    appUrlSlug={appUrlSlug}
                     appVersion={appVersion}
                     url={url}
                     apiVersion={apiVersion}
@@ -62,6 +64,7 @@ const AppAdapter = ({
                 <PWALoadingBoundary>
                     <ServerVersionProvider
                         appName={appName}
+                        appUrlSlug={appUrlSlug}
                         appVersion={appVersion}
                         url={url}
                         apiVersion={apiVersion}
@@ -87,6 +90,7 @@ const AppAdapter = ({
 
 AppAdapter.propTypes = {
     appName: PropTypes.string.isRequired,
+    appUrlSlug: PropTypes.string.isRequired,
     appVersion: PropTypes.string.isRequired,
     apiVersion: PropTypes.number,
     children: PropTypes.element,
diff --git a/adapter/src/utils/customTranslations.js b/adapter/src/utils/customTranslations.js
new file mode 100644
index 000000000..02f14a996
--- /dev/null
+++ b/adapter/src/utils/customTranslations.js
@@ -0,0 +1,67 @@
+import { useConfig, useDataQuery } from '@dhis2/app-runtime'
+import i18n from '@dhis2/d2-i18n'
+import { useCallback } from 'react'
+import { I18N_NAMESPACE } from './localeUtils'
+
+const customTranslationsQuery = {
+    customTranslations: {
+        resource: 'dataStore/custom-translations',
+        id: ({ appUrlSlug, dhis2Locale }) => `${appUrlSlug}--${dhis2Locale}`,
+    },
+}
+/**
+ * Returns a function to look for custom translations for this app and locale
+ * in the datastore, using a key convention with the app name and user locale
+ * in the 'custom-translations' namespace.
+ * If the translations exist, they will be added to the translation bundle for
+ * the user's locale. This search will run asynchronously and is not awaited,
+ * but it will usually resolve before the app's main translation bundles are
+ * added, so steps are taken to make sure the custom translations take priority
+ * over (and don't get overwritten by) the main app translations
+ */
+export const useCustomTranslations = () => {
+    const { appUrlSlug } = useConfig()
+    const { refetch } = useDataQuery(customTranslationsQuery, {
+        lazy: true,
+        // dhis2locale should be sent as a variable at query time
+        variables: { appUrlSlug },
+    })
+
+    const getCustomTranslations = useCallback(
+        /**
+         * Checks the datastore for custom translations and loads them if found
+         * @param {Object} params
+         * @param {Intl.Locale} params.locale - The parsed locale in BCP47 format
+         * @param {string} params.dhis2Locale - The locale in DHIS2 format
+         */
+        async ({ locale, dhis2Locale }) => {
+            if (!dhis2Locale) {
+                return
+            }
+            try {
+                const data = await refetch({ dhis2Locale })
+                console.log('adding datastore resources', {
+                    basename: locale.baseName,
+                    tx: data.customTranslations,
+                })
+                i18n.addResourceBundle(
+                    locale?.baseName ?? 'en',
+                    I18N_NAMESPACE,
+                    data.customTranslations,
+                    true, // 'deep' -- add keys in this bundle to existing translations
+                    true // 'overwrite' -- overwrite already existing keys
+                )
+                console.log({
+                    rb: i18n.getResourceBundle(locale.baseName, I18N_NAMESPACE),
+                })
+            } catch {
+                console.log(
+                    `No custom translations found in the datastore for this app and locale (looked for the key ${appUrlSlug}--${dhis2Locale} in the custom-translations namespace)`
+                )
+            }
+        },
+        [refetch, appUrlSlug]
+    )
+
+    return getCustomTranslations
+}
diff --git a/adapter/src/utils/localeUtils.js b/adapter/src/utils/localeUtils.js
index 0fd5f4bb4..0641e48df 100644
--- a/adapter/src/utils/localeUtils.js
+++ b/adapter/src/utils/localeUtils.js
@@ -2,17 +2,23 @@ import i18n from '@dhis2/d2-i18n'
 import moment from 'moment'
 
 // Init i18n namespace
-const I18N_NAMESPACE = 'default'
+export const I18N_NAMESPACE = 'default'
 i18n.setDefaultNamespace(I18N_NAMESPACE)
 
 /**
  * userSettings.keyUiLocale is expected to be formatted by Java's
- * Locale.toString():
+ * Locale.toString()... kind of: <language>[_<REGION>[_<Script>]]
+ * https://github.com/dhis2/dhis2-core/pull/22819
  * https://docs.oracle.com/javase/8/docs/api/java/util/Locale.html#toString--
  * We can assume there are no Variants or Extensions to locales used by DHIS2
- * @param {Intl.Locale} locale
+ *
+ * Note: if a BCP 47 language tag-formatted locale is provided for the `locale`
+ * argument, this function happens to work as well
+ *
+ * @param {string} locale
+ * @returns Intl.Locale
  */
-const parseJavaLocale = (locale) => {
+const parseDhis2Locale = (locale) => {
     const [language, region, script] = locale.split('_')
 
     let languageTag = language
@@ -38,7 +44,7 @@ export const parseLocale = (userSettings) => {
         }
         // legacy property
         if (userSettings.keyUiLocale) {
-            return parseJavaLocale(userSettings.keyUiLocale)
+            return parseDhis2Locale(userSettings.keyUiLocale)
         }
     } catch (err) {
         console.error('Unable to parse locale from user settings:', {
diff --git a/adapter/src/utils/useLocale.js b/adapter/src/utils/useLocale.js
index b1ee33490..8ddd9d697 100644
--- a/adapter/src/utils/useLocale.js
+++ b/adapter/src/utils/useLocale.js
@@ -1,6 +1,7 @@
 import { useDataQuery } from '@dhis2/app-runtime'
 import i18n from '@dhis2/d2-i18n'
 import { useState, useEffect, useMemo } from 'react'
+import { useCustomTranslations } from './customTranslations.js'
 import {
     setI18nLocale,
     parseLocale,
@@ -9,6 +10,7 @@ import {
 } from './localeUtils.js'
 
 const useLocale = ({ userSettings, configDirection }) => {
+    const getCustomTranslations = useCustomTranslations()
     const [result, setResult] = useState({
         locale: undefined,
         direction: undefined,
@@ -21,6 +23,10 @@ const useLocale = ({ userSettings, configDirection }) => {
 
         const locale = parseLocale(userSettings)
 
+        // Asynchronous
+        getCustomTranslations({ locale, dhis2Locale: userSettings.keyUiLocale })
+
+        // Synchronous -- will resolve before state is set and the child app is rendered
         setI18nLocale(locale)
         setMomentLocale(locale)
 
@@ -30,7 +36,7 @@ const useLocale = ({ userSettings, configDirection }) => {
         document.documentElement.setAttribute('lang', locale.baseName)
 
         setResult({ locale, direction: localeDirection })
-    }, [userSettings, configDirection])
+    }, [userSettings, configDirection, getCustomTranslations])
 
     return result
 }
diff --git a/cli/src/lib/env/getEnv.js b/cli/src/lib/env/getEnv.js
index 81f45f34c..c4fb0d2cb 100644
--- a/cli/src/lib/env/getEnv.js
+++ b/cli/src/lib/env/getEnv.js
@@ -33,6 +33,11 @@ const prefixEnvForCRA = (env) =>
 const getShellEnv = (config) => {
     const shellEnv = {
         name: config.title,
+        // Added after 'name' key was already taken by the above (config.title):
+        url_slug: config.name,
+        // Currently an alias for 'name', but can be used to switch 'name'
+        // to config.name (it would be nice for these to match d2 config)
+        title: config.title,
         version: config.version,
         loginApp: config.type === 'login_app' ? 'true' : undefined,
         direction: config.direction,
diff --git a/cli/src/lib/i18n/templates/locales.hbs b/cli/src/lib/i18n/templates/locales.hbs
index feb3cce68..3cc0aff06 100644
--- a/cli/src/lib/i18n/templates/locales.hbs
+++ b/cli/src/lib/i18n/templates/locales.hbs
@@ -13,10 +13,13 @@ import {{ lang }}Translations from './{{ lang }}/translations.json'
 {{/each}}
 
 const namespace = '{{ namespace }}'
+
+// Use 'deep' = true and 'overwrite' = false to add to, but not overwrite,
+// custom translations from the datastore (added by the app adapter)
 {{#each langs as |lang key|}}
 
-i18n.addResources('{{ lang }}', namespace, {{ lang }}Translations)
-i18n.addResources('{{ lookup ../standardLanguageCodes lang }}', namespace, {{ lang }}Translations)
+i18n.addResourceBundle('{{ lang }}', namespace, {{ lang }}Translations, true, false)
+i18n.addResourceBundle('{{ lookup ../standardLanguageCodes lang }}', namespace, {{ lang }}Translations, true, false)
 {{/each}}
 
 export default i18n
diff --git a/shell/src/App.jsx b/shell/src/App.jsx
index dfdff99c4..aa24f28a8 100644
--- a/shell/src/App.jsx
+++ b/shell/src/App.jsx
@@ -42,6 +42,7 @@ const requiredPluginProps = parseRequiredProps(
 const appConfig = {
     url: getInjectedBaseUrl() || process.env.REACT_APP_DHIS2_BASE_URL,
     appName: process.env.REACT_APP_DHIS2_APP_NAME || '',
+    appUrlSlug: process.env.DHIS2_APP_URL_SLUG || '',
     appVersion: process.env.REACT_APP_DHIS2_APP_VERSION || '',
     apiVersion: parseInt(process.env.REACT_APP_DHIS2_API_VERSION),
     pwaEnabled: process.env.REACT_APP_DHIS2_APP_PWA_ENABLED === 'true',