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

vendor/code.gitea.io/sdk/gitea/user.go

@@ -22,6 +22,8 @@ type User struct {
 	Email string `json:"email"`
 	// URL to the user's avatar
 	AvatarURL string `json:"avatar_url"`
+	// User locale
+	Language string `json:"language"`
 }
 
 // MarshalJSON implements the json.Marshaler interface for User, adding field(s) for backward compatibility