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

models/user.go

@@ -94,6 +94,7 @@ type User struct {
 	Website          string
 	Rands            string `xorm:"VARCHAR(10)"`
 	Salt             string `xorm:"VARCHAR(10)"`
+	Language         string `xorm:"VARCHAR(5)"`
 
 	CreatedUnix   util.TimeStamp `xorm:"INDEX created"`
 	UpdatedUnix   util.TimeStamp `xorm:"INDEX updated"`
@@ -185,6 +186,7 @@ func (u *User) APIFormat() *api.User {
 		FullName:  u.FullName,
 		Email:     u.getEmail(),
 		AvatarURL: u.AvatarLink(),
+		Language:  u.Language,
 	}
 }