[React] UI Translation Updates (#6257)

* Move locales definition into separate file

- Cleanup settings.py a bit

* Update docstring

* Expose 'default_locale' to info API endpoint

* Validate settings.LANGUAGE_CODE

* Fix bug in BuildDetail page

* Use selected language when making API queries

* Translate more strings

* Tweak variable name

* Update locale config

* Remove duplicate code

* Remove compiled messages.ts translation files

* Fixes for LanguageContext.tsx

* Update messages.d.ts for sr locale

* Ensure compiled files are served by django runserver

* Amend changes to STATICFILES_DIRS

* Cleanup prerender.py

* Refetch status codes when locale is changed

* Fix log msg

* Clear out old static files

tasks.py

@@ -298,7 +298,7 @@ def static(c, frontend=False):
     manage(c, 'prerender')
     if frontend and node_available():
         frontend_build(c)
-    manage(c, 'collectstatic --no-input')
+    manage(c, 'collectstatic --no-input --clear')
 
 
 @task