Fix i18n system

i18n.yaml

@@ -1,3 +1,7 @@
 en:
   start: "Hello, {message.from_user.full_name}"
   help: "Just simple bot, which greets the user. Use /start"
+
+ru:
+  start: "Привет, {message.from_user.full_name}"
+  help: "Это простой бот, который приветствует пользователя. Используй /start"

mybot/__init__.py

@@ -7,6 +7,6 @@ from .i18n import I18N
 def main():
     config = Config()
     logger = create_logger("mybot", config.LOG_LEVEL)
-    i18n = I18N(logger, config.I18N_PATH)
+    i18n = I18N(logger, config.I18N_PATH, config.I18N_LANG, config.I18N_FALLBACK_LANG)
     bot = create_bot(config, logger, i18n)
     bot.infinity_polling(config.TIMEOUT, config.DROP_PENDING, config.POLLING_TIMEOUT)

mybot/config.py

@@ -17,6 +17,7 @@ class Config:
     # i18n
     I18N_PATH: str = os.getenv("I18N_PATH", "i18n.yaml")
     I18N_LANG: str = os.getenv("I18N_LANG", "en")
+    I18N_FALLBACK_LANG: str = os.getenv("I18N_FALLBACK_LANG", "en")
 
     # state storage
     SS_TYPE: str = os.getenv("SS_TYPE", "memory").lower()

mybot/i18n.py

@@ -5,10 +5,14 @@ from yaml import safe_load
 
 
 class I18N:
-    def __init__(self, logger: logging.Logger, path="i18n.yaml", fallback_lang="en"):
+    def __init__(self, logger: logging.Logger,
+                 path: str = "i18n.yaml",
+                 lang: Optional[str] = None,
+                 fallback_lang: str = "en"):
         self.logger = logger
         self._path = path
         self._fallback_lang = fallback_lang
+        self._lang = lang or self.fallback_lang
         self._dict = dict()
         self.load()
 
@@ -20,6 +24,16 @@ class I18N:
     def fallback_lang(self):
         return self._fallback_lang
 
+    def set_lang(self, lang: Optional[str] = None):
+        if lang in self._dict:
+            self._lang = lang
+        else:
+            self._lang = self.fallback_lang
+
+    @property
+    def lang(self):
+        return self._lang
+
     def load(self):
         self._dict.clear()
         with open(self._path) as f:
@@ -28,7 +42,7 @@ class I18N:
             raise RuntimeError("I18N file doesn't contain fallback language section")
 
     def get(self, phrase: str, lang: Optional[str] = None):
-        lang = lang or self.fallback_lang
+        lang = lang or self.lang
         if lang not in self._dict:
             self.logger.warning(f"Language '{lang}' not found in i18n, using fallback")
             lang = self.fallback_lang