add user language value to hidden input to enable saving of profile without changing language (#3967)

templates/user/settings/profile.tmpl

@@ -43,7 +43,7 @@
 					<div class="field">
 						<label for="language">{{.i18n.Tr "settings.language"}}</label>
 						<div class="ui language selection dropdown" id="language">
-							<input name="language" type="hidden">
+							<input name="language" type="hidden" value="{{.SignedUser.Language}}">
 							<i class="dropdown icon"></i>
 							<div class="text">{{range .AllLangs}}{{if eq $.SignedUser.Language .Lang}}{{.Name}}{{end}}{{end}}</div>
 							<div class="menu">