More robust entry of the team URL

[ruKurz]

Make sure that the support form works correctly when entering a valid URL.

Current situation
Currently, sending the support form only works if the entered address ends with the TLD. If the URL contains a path part or parameter, this leads to an error when sending.

Expected situation
If the entered URL is syntactically correct, the application should ensure the correct processing of the URL and, for example, throw everything away after the TLD in the URL.