impl(cm): implement change_theme and change_language callbacks (rustdesk#14782)

* docs: fix typos in documentation and code comments

- Fix 'seperated' -> 'separated' in remote_input.dart
- Fix 'seperators' -> 'separators' in fuse/cs.rs
- Update outdated 'OSX' -> 'macOS' in virtual display README

Signed-off-by: pallab-js <sonowalpallabjyoti@gmail.com>

* impl(cm): implement change_theme and change_language callbacks

These callbacks were previously empty TODO stubs.
Now they properly invoke the Sciter UI handlers to notify
the UI when theme or language changes occur.

Signed-off-by: pallab-js <sonowalpallabjyoti@gmail.com>

---------

Signed-off-by: pallab-js <sonowalpallabjyoti@gmail.com>

Author: pallab-js

flutter/lib/common/widgets/remote_input.dart

@@ -31,7 +31,7 @@ class RawKeyFocusScope extends StatelessWidget {
     // https://github.com/flutter/flutter/issues/154053
     final useRawKeyEvents = isLinux && !isWeb;
     // FIXME: On Windows, `AltGr` will generate `Alt` and `Control` key events,
-    // while `Alt` and `Control` are seperated key events for en-US input method.
+    // while `Alt` and `Control` are separated key events for en-US input method.
     return FocusScope(
         autofocus: true,
         child: Focus(

libs/clipboard/src/platform/unix/fuse/cs.rs

@@ -12,7 +12,7 @@
 //!
 //! For now, we transfer all file names with windows separators, UTF-16 encoded.
 //! *Need a way to transfer file names with '\' safely*.
-//! Maybe we can use URL encoded file names and '/' seperators as a new standard, while keep the support to old schemes.
+//! Maybe we can use URL encoded file names and '/' separators as a new standard, while keep the support to old schemes.
 //!
 //! # Note
 //! - all files on FS should be read only, and mark the owner to be the current user

libs/virtual_display/dylib/README.md

@@ -29,4 +29,4 @@ TODO
 
 ## X11
 
-## OSX
+## macOS

src/ui/cm.rs

@@ -52,12 +52,12 @@ impl InvokeUiCM for SciterHandler {
         self.call("newMessage", &make_args!(id, text));
     }
 
-    fn change_theme(&self, _dark: String) {
-        // TODO
+    fn change_theme(&self, dark: String) {
+        self.call("changeTheme", &make_args!(dark));
     }
 
     fn change_language(&self) {
-        // TODO
+        self.call("changeLanguage", &make_args!());
     }
 
     fn show_elevation(&self, show: bool) {