feat(tools): pick among interchangeable language servers for every language (#313)

A language server and the fallback servers after it in languages/*.toml now share one picker in the Language Servers details pane, for every language rather than Python only: Language server for <languages>: Automatic, each server (with its status) or None, with the Automatic order in the hint. Servers outside such a group keep their on/off checkbox. ToolInfo.alternatives lists each server's group in preference order; a regular server after a fallback starts no group with it. The Python-only picker at the top of the page is removed, and names drop a language suffix the label already states. Storage is unchanged (each server's enabled flag, global or project scope), so existing settings carry over.

src/platform/locales/text/zh.json

@@ -4555,10 +4555,10 @@
   "Unversioned": "未跟踪",
   "Merge conflict": "合并冲突",
   "by {author}": "由 {author} 创建",
-  "Automatic (first available)": "自动（第一个可用的）",
+  "Automatic": "自动",
   "Custom combination": "自定义组合",
-  "Python language server": "Python 语言服务器",
-  "Only one of these built-in Python analyzers runs at a time.": "这些内置 Python 分析器同一时间只运行一个。",
+  "Language server for {languages}": "{languages} 语言服务器",
+  "Only one of these runs at a time. Automatic uses the first one available: {order}.": "这些服务器同一时间只运行一个。自动模式使用第一个可用的：{order}。",
   "Configure the settings related to version control used in your project": "配置项目中使用的版本控制相关设置",
   "Use non-modal commit interface": "使用非模态提交界面",
   "When off, Local Changes and Stash are tabs of the Git tool window and Commit opens a dialog.": "关闭时，本地更改和贮藏作为 Git 工具窗口的标签页显示，提交时打开对话框。",