Is it possible to check is loaded language files correctly with WordPress plugin?

For plugins using the directory referred to by load_plugin_textdomain, the language files should be named “domain-locale.mo”.

So for your case, the filenames should be mysignup-bn_BD.mo.

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)