feat: add commit language option for commit message localization

aider/args.py

@@ -731,6 +731,12 @@ def get_parser(default_config_files, git_root):
         default=None,
         help="Specify the language to use in the chat (default: None, uses system settings)",
     )
+    group.add_argument(
+        "--commit-language",
+        metavar="COMMIT_LANGUAGE",
+        default=None,
+        help="Specify the language to use in the commit message (default: None, user language)",
+    )
     group.add_argument(
         "--yes-always",
         action="store_true",

aider/coders/base_coder.py

@@ -118,6 +118,7 @@ class Coder:
     detect_urls = True
     ignore_mentions = None
     chat_language = None
+    commit_language = None
     file_watcher = None
 
     @classmethod
@@ -328,6 +329,7 @@ class Coder:
         num_cache_warming_pings=0,
         suggest_shell_commands=True,
         chat_language=None,
+        commit_language=None,
         detect_urls=True,
         ignore_mentions=None,
         total_tokens_sent=0,
@@ -341,6 +343,7 @@ class Coder:
 
         self.event = self.analytics.event
         self.chat_language = chat_language
+        self.commit_language = commit_language
         self.commit_before_message = []
         self.aider_commit_hashes = set()
         self.rejected_urls = set()

aider/main.py

@@ -993,6 +993,7 @@ def main(argv=None, input=None, output=None, force_git_root=None, return_coder=F
             num_cache_warming_pings=args.cache_keepalive_pings,
             suggest_shell_commands=args.suggest_shell_commands,
             chat_language=args.chat_language,
+            commit_language=args.commit_language,
             detect_urls=args.detect_urls,
             auto_copy_context=args.copy_paste,
             auto_accept_architect=args.auto_accept_architect,

aider/repo.py

@@ -210,6 +210,8 @@ class GitRepo:
         else:
             user_language = None
             if coder:
+                user_language = coder.commit_language
+                if not user_language:
                     user_language = coder.get_user_language()
             commit_message = self.get_commit_message(diffs, context, user_language)