3 files changed, 10 insertions, 8 deletions

diff --git a/server/lib/plugins/plugin-manager.ts b/server/lib/plugins/plugin-manager.ts
index f3766ffa8..ae05af721 100644
--- a/server/lib/plugins/plugin-manager.ts
+++ b/server/lib/plugins/plugin-manager.ts
@@ -23,6 +23,7 @@ import { PluginLibrary, RegisterServerAuthExternalOptions, RegisterServerAuthPas
 import { ClientHtml } from '../client-html'
 import { RegisterHelpers } from './register-helpers'
 import { installNpmPlugin, installNpmPluginFromDisk, removeNpmPlugin } from './yarn'
+import { getCompleteLocale } from '@shared/core-utils'
 
 export interface RegisteredPlugin {
   npmName: string
@@ -444,10 +445,12 @@ export class PluginManager implements ServerHook {
       const path = translationPaths[locale]
       const json = await readJSON(join(this.getPluginPath(plugin.name, plugin.type), path))
 
-      if (!this.translations[locale]) this.translations[locale] = {}
-      this.translations[locale][npmName] = json
+      const completeLocale = getCompleteLocale(locale)
 
-      logger.info('Added locale %s of plugin %s.', locale, npmName)
+      if (!this.translations[completeLocale]) this.translations[completeLocale] = {}
+      this.translations[completeLocale][npmName] = json
+
+      logger.info('Added locale %s of plugin %s.', completeLocale, npmName)
     }
   }
 
diff --git a/shared/core-utils/i18n/i18n.ts b/shared/core-utils/i18n/i18n.ts
index a342cb3f8..f27de20f1 100644
--- a/shared/core-utils/i18n/i18n.ts
+++ b/shared/core-utils/i18n/i18n.ts
@@ -75,9 +75,9 @@ export function isDefaultLocale (locale: string) {
 }
 
 export function peertubeTranslate (str: string, translations?: { [ id: string ]: string }) {
-  // FIXME: remove disable rule when the client is upgraded to typescript 3.7
-  // eslint-disable-next-line
-  return translations && translations[str] ? translations[str] : str
+  if (!translations || !translations[str]) return str
+
+  return translations[str]
 }
 
 const possiblePaths = POSSIBLE_LOCALES.map(l => '/' + l)
diff --git a/support/doc/plugins/guide.md b/support/doc/plugins/guide.md
index 17c681afd..5b5a3065d 100644
--- a/support/doc/plugins/guide.md
+++ b/support/doc/plugins/guide.md
@@ -744,7 +744,7 @@ If you want to translate strings of your plugin (like labels of your registered
 {
   ...,
   "translations": {
-    "fr-FR": "./languages/fr.json",
+    "fr": "./languages/fr.json",
     "pt-BR": "./languages/pt-BR.json"
   },
   ...
@@ -752,7 +752,6 @@ If you want to translate strings of your plugin (like labels of your registered
 ```
 
 The key should be one of the locales defined in [i18n.ts](https://github.com/Chocobozzz/PeerTube/blob/develop/shared/models/i18n/i18n.ts).
-You **must** use the complete locales (`fr-FR` instead of `fr`).
 
 Translation files are just objects, with the english sentence as the key and the translation as the value.
 `fr.json` could contain for example: