Enable changing editor language without restart

Author: KoBeWi

editor/editor_node.cpp

@@ -7369,7 +7369,7 @@ EditorNode::EditorNode() {
 	main_menu->set_switch_on_hover(true);
 
 	file_menu = memnew(PopupMenu);
-	file_menu->set_name(TTR("Scene"));
+	file_menu->set_name(TTRC("Scene"));
 	main_menu->add_child(file_menu);
 	main_menu->set_menu_tooltip(0, TTR("Operations with scene files."));
 
@@ -7494,7 +7494,7 @@ EditorNode::EditorNode() {
 #endif
 
 	project_menu = memnew(PopupMenu);
-	project_menu->set_name(TTR("Project"));
+	project_menu->set_name(TTRC("Project"));
 	main_menu->add_child(project_menu);
 
 	project_menu->add_shortcut(ED_SHORTCUT_AND_COMMAND("editor/project_settings", TTRC("Project Settings..."), Key::NONE, TTRC("Project Settings")), PROJECT_OPEN_SETTINGS);
@@ -7552,11 +7552,11 @@ EditorNode::EditorNode() {
 
 	// Options are added and handled by DebuggerEditorPlugin.
 	debug_menu = memnew(PopupMenu);
-	debug_menu->set_name(TTR("Debug"));
+	debug_menu->set_name(TTRC("Debug"));
 	main_menu->add_child(debug_menu);
 
 	settings_menu = memnew(PopupMenu);
-	settings_menu->set_name(TTR("Editor"));
+	settings_menu->set_name(TTRC("Editor"));
 	main_menu->add_child(settings_menu);
 
 #ifdef MACOS_ENABLED
@@ -7607,7 +7607,7 @@ EditorNode::EditorNode() {
 #endif
 
 	help_menu = memnew(PopupMenu);
-	help_menu->set_name(TTR("Help"));
+	help_menu->set_name(TTRC("Help"));
 	if (global_menu && NativeMenu::get_singleton()->has_system_menu(NativeMenu::HELP_MENU_ID)) {
 		help_menu->set_system_menu(NativeMenu::HELP_MENU_ID);
 	}

editor/editor_settings.cpp

@@ -68,6 +68,10 @@ bool EditorSettings::_set(const StringName &p_name, const Variant &p_value) {
 	if (changed && initialized) {
 		changed_settings.insert(p_name);
 		emit_signal(SNAME("settings_changed"));
+
+		if (p_name == SNAME("interface/editor/editor_language")) {
+			setup_language();
+		}
 	}
 	return true;
 }
@@ -1256,9 +1260,9 @@ void EditorSettings::create() {
 
 void EditorSettings::setup_language() {
 	String lang = get("interface/editor/editor_language");
-	TranslationServer::get_singleton()->set_locale(lang);
 
 	if (lang == "en") {
+		TranslationServer::get_singleton()->set_locale(lang);
 		return; // Default, nothing to do.
 	}
 	// Load editor translation for configured/detected locale.
@@ -1270,6 +1274,8 @@ void EditorSettings::setup_language() {
 
 	// Load extractable translation for projects.
 	load_extractable_translations(lang);
+
+	TranslationServer::get_singleton()->set_locale(lang);
 }
 
 void EditorSettings::setup_network() {

scene/main/scene_tree.cpp

@@ -770,9 +770,7 @@ void SceneTree::_main_window_focus_in() {
 void SceneTree::_notification(int p_notification) {
 	switch (p_notification) {
 		case NOTIFICATION_TRANSLATION_CHANGED: {
-			if (!Engine::get_singleton()->is_editor_hint()) {
-				get_root()->propagate_notification(p_notification);
-			}
+			get_root()->propagate_notification(p_notification);
 		} break;
 
 		case NOTIFICATION_OS_MEMORY_WARNING: