Added user language setting (#3875)

* Added user language setting

* Added translation string for setting

* Fixed import order + typo

* improved checking if the user has a language saved in the db

* The current saved language is now set a default inside the dropdown

* fmt

* When a user signs in and doesn't have a language saved, the current browser language is saved

* updated gitea-sdk

* Merge branch 'master' of https://github.com/go-gitea/gitea into save-user-language

# Conflicts:
#	models/migrations/migrations.go
#	models/migrations/v62.go

* Made tests work again

* trigger CI

* trigger CI

* fmt

* re-trigger that FUCKING CI SO IT REALLY PICKS UP THE LATEST COMMIT ISTEAD OF PREDENDING TO DO SO

* re-trigger that FUCKING CI SO IT REALLY PICKS UP THE LATEST COMMIT ISTEAD OF PREDENDING TO DO SO

* When loggin in, only the language col gets updated instead of everything

modules/auth/user_form.go

@@ -109,6 +109,7 @@ type UpdateProfileForm struct {
 	KeepEmailPrivate bool
 	Website          string `binding:"ValidUrl;MaxSize(255)"`
 	Location         string `binding:"MaxSize(50)"`
+	Language         string `binding:"Size(5)"`
 }
 
 // Validate validates the fields