buffer: Keep the shorter language setting names for the common operation (#43915)

cc
https://github.com/zed-industries/zed/pull/43888#issuecomment-3597265087

Release Notes:

- N/A *or* Added/Fixed/Improved ...

crates/git_ui/src/commit_view.rs

@@ -780,7 +780,7 @@ async fn build_buffer(
             text,
         );
         let mut buffer = Buffer::build(buffer, Some(blob), Capability::ReadWrite);
-        buffer.set_language(language, cx);
+        buffer.set_language_async(language, cx);
         buffer
     })?;
     Ok(buffer)

crates/git_ui/src/git_panel.rs

@@ -1628,7 +1628,7 @@ impl GitPanel {
         }
         let buffer = cx.new(|cx| {
             let mut buffer = Buffer::local(message, cx);
-            buffer.set_language_immediate(git_commit_language, cx);
+            buffer.set_language(git_commit_language, cx);
             buffer
         });
         let editor = cx.new(|cx| Editor::for_buffer(buffer, None, window, cx));

crates/git_ui/src/text_diff_view.rs

@@ -240,7 +240,7 @@ fn build_clipboard_buffer(
     cx.new(|cx| {
         let mut buffer = language::Buffer::local(source_buffer_snapshot.text(), cx);
         let language = source_buffer.read(cx).language().cloned();
-        buffer.set_language_immediate(language, cx);
+        buffer.set_language(language, cx);
 
         let range_start = source_buffer_snapshot.point_to_offset(replacement_range.start);
         let range_end = source_buffer_snapshot.point_to_offset(replacement_range.end);