[openstreetmap/openstreetmap-website] Change language immediately after updating settings (#1883)

[Jamie Guthrie]

jguthrie100 commented on this pull request.



> @@ -189,7 +189,7 @@ def preferred_language
   end
 
   def preferred_languages
-    @preferred_languages ||= Locale.list(languages)
+    Locale.list(languages)

Added and `after_save` method and it works much better

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