Redirection on /donate drop the query parameter

Originally created by @sajolida on #16259 (Redmine)

Until recently we’ve used URLs like https://tails.boum.org/donate?r=plans2019. See git grep '?r=' -- "*.*m*". And they worked.

Today I noticed that I now have to add the canonical slash to make them work: https://tails.boum.org/donate/?r=progress. Otherwise the query parameter is dropped.

Which is harder:

• Fixing the redirections (sysadmins)?
• Fixing all previous such URLs on our website (I can do that)?

I’m also afraid of doing this same mistake again the future by habit…

Feature Branch: web/16259-slash-on-donate

Related issues

• Related to #16220 (closed)