Empty login screen after installing version 1.9.10

[max951]

Discussed in #447

^{Originally posted by xaver-ius December 7, 2023}
I was lucky to install the package using sqlite, but after saving the settings the login screen is empty.
I don't have an idea what has to be done ...

I think, I run into the same error.
After activate error messages in php.ini this error was shown:
Fatal error: Uncaught ValueError: mb_internal_encoding(): Argument #1 ($encoding) must be a valid encoding, "charset" given in /html/webcalendar/includes/classes/WebCalendar.php:946 Stack trace: #0 /html/webcalendar/includes/classes/WebCalendar.php(946): mb_internal_encoding('...') #1 /html/webcalendar/includes/classes/WebCalendar.php(1034): WebCalendar->_initTranslate() #2 /html/webcalendar/login.php(51): WebCalendar->setLanguage() #3 {main} thrown in /html/webcalendar/includes/classes/WebCalendar.php on line 946

After some analysis, I believe that the fallback character "=" for "charset" in the translation files does not work at this point, as it passes the string "charset" to the mb_internal_encoding function instead of "utf-8" or "iso-8859-1" or some other charset code.

After replacing the line in the translation file (in my case: translations/German.txt)
charset: =
to
charset: iso-8859-1
the login form appears as expected.

[craigk5n]

Code in master has been updates. Thanks for the fix!