Pyrogram InlineKeyboardButton + Callback Handling

from pyrogram import Client, filters
from pyrogram.types import InlineKeyboardMarkup, InlineKeyboardButton

# BotApp
app = Client(
  name="SESSION_NAME",
  bot_token="BOT_TOKEN",
  # ACCOUNT_NAME
  api_id=API_ID,
  api_hash="API_HASH",
  device_model="TITLE_ON_DEVICES_SECTION",
  app_version="TEXT_ON_DEVICES_SECTION"
)

@app.on_message(filters.command(["start"]))
async def on_start_command(c, m):
  
  # Get current chat ID (bot's chat)
  CurrentChatID = m.chat.id
  
  # Send language selection buttons
  SetLang = await app.send_message(
    chat_id=CurrentChatID,
    text="Select your language:",

    reply_markup=InlineKeyboardMarkup(
      [
        [
          InlineKeyboardButton(
            text="🇬🇧 English",
            callback_data="EN"
          ),

          InlineKeyboardButton(
            text="🇮🇷 فارسی",
            callback_data="FA"
          )
        ]
      ]
    )
  )

  # Activate callback of language selection buttons
  # Works with callback_data text as regex (EN or FA)
  @app.on_callback_query(filters.regex(pattern=(r"EN|FA")))
  async def on_language_inlinekeyboard(bot, callbackdata):
    # Remove language selection message
    await SetLang.delete()
  
    # Send selection result (callbackdata) to the user
    await app.send_message(
      chat_id=CurrentChatID,
      text=str(callbackdata.data)
    )

app.run()