进一步的 kvmd 国际化（汉化）支持，添加配置入口

yaml 配置示例：
```
languages:
    console: zh
    web: zh
```

kvmd/languages.py

@@ -0,0 +1,18 @@
+from gettext import translation
+
+class Languages:
+    use_ttranslation = None
+    languages = "default"
+    
+    @classmethod
+    def gettext(cls, string: str) -> str:
+        if cls.languages == "default" or cls.languages == "en" :
+            return string
+        else:
+            return cls.use_ttranslation(string)
+        
+    @classmethod
+    def init(cls, domain:str, localedir: str, languages: str) -> None:
+        cls.languages = languages
+        cls.use_ttranslation = translation(domain=domain, localedir=localedir, languages=[cls.languages]).gettext
+