🌎 i18n: React-i18next & i18next Integration (#5720)

* better i18n support an internationalization-framework.

* removed unused package

* auto sort for translation.json

* fixed tests with the new locales function

* added new CI actions from locize

* to use locize a mention in the README.md

* to use locize a mention in the README.md

* updated README.md and added TRANSLATION.md to the repo

* updated TRANSLATION.md badges

* updated README.md to go to the TRANSLATION.md when clicking on the Translation Progress badge

* updated TRANSLATION.md and added a new issue template.

* updated TRANSLATION.md and added a new issue template.

* updated issue template to add the iso code link.

* updated the new GitHub actions for `locize`

* updated label for new issue template --> i18n

* fixed type issue

* Fix eslint

* Fix eslint with key-spacing spacing

* fix: error type

* fix: handle undefined values in SortFilterHeader component

* fix: typing in Image component

* fix: handle optional promptGroup in PromptCard component

* fix: update localize function to accept string type and remove unnecessary JSX element

* fix: update localize function to enforce TranslationKeys type for better type safety

* fix: improve type safety and handle null values in Assistants component

* fix: enhance null checks for fileId in FilesListView component

* fix: localize 'Go back' button text in FilesListView component

* fix: update aria-label for menu buttons and add translation for 'Close Menu'

* docs: add Reasoning UI section for Chain-of-Thought AI models in README

* fix: enhance type safety by adding type for message in MultiMessage component

* fix: improve null checks and optional chaining in useAutoSave hook

* fix: improve handling of optional properties in cleanupPreset function

* fix: ensure isFetchingNextPage defaults to false and improve null checks for messages in Search component

* fix: enhance type safety and null checks in useBuildMessageTree hook

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Co-authored-by: Danny Avila <danny@librechat.ai>

client/src/components/Files/FileList/DataTableFile.tsx

@@ -244,9 +244,10 @@ export default function DataTableFile<TData, TValue>({
       <div className="ml-4 mr-4 mt-4 flex h-auto items-center justify-end space-x-2 py-4 sm:ml-0 sm:mr-0 sm:h-0">
         <div className="text-muted-foreground ml-2 flex-1 text-sm">
           {localize(
-            'com_files_number_selected',
-            `${table.getFilteredSelectedRowModel().rows.length}`,
-            `${table.getFilteredRowModel().rows.length}`,
+            'com_files_number_selected', {
+              0: `${table.getFilteredSelectedRowModel().rows.length}`,
+              1: `${table.getFilteredRowModel().rows.length}`,
+            },
           )}
         </div>
         <Button