sprint2 changes: ui framework update, theme update and other ui/ux changes

Changes of this version are deployed on the Damned Lies testing instance. You can review them live.

In this merge request, many changes occurred, all referenced in the %sprint_2 milestone.

Core

• The Bootstrap theme has been updated to Bootstrap 5.2.1. I took control over the gnome-bootstrap-theme project on Gitlab to automatically build the Deneb theme for Bootstrap.
• pre-commit is now used in order to check the changes before each commit.
• Make it easier to use the PyCharm IDE with custom configurations.
• #350 (closed): remove reference to Canonical hosting.

UI/UX

• #118 (closed): the padding for update and download buttons was reduced.
• #141 (closed): some formulations were reworded to be more natural
• #44 (closed): organise modules (in /modules) by module categories. A translation percentage is shown for each module, depending on whether there is a standard domain for ui and doc. If missing, shows a missing badge.
• The message to declare an error in the teams, modules apps is now shown on top.
• Download all po files for a release set is now on top (example here)
• Display the user team and user language on top of teams/language app.
• The downloadable RSS file on the language application is now understandable once downloaded.
• #138 (closed): update vertimus application with recommendations made by @tomtryf. The state of translation is now shown with different colors. The date/hour of last action is now more visible.
• There is a link to access the documentation of a user interface po file if any, and vice versa.
• If there are multiple domains for the same branch in a module, they are better separated on the module page.
• The vertimus actions in the user profile are sorted in reversed chronological order: the most recent activity on top.

Admin

• More fields are shown for objects in the administration panel. It should not lead to slowdowns.

User profile

• #321 (closed): the user profile has been updated, the svn_account field was changed to forge_account which is a more generic field. The forge account username is now clickeable and links to the user’s Gitlab account.
• irc_nickname renamed to im_nickname and is now for Matrix usernames.
• #238 (closed) review user profile and templates. Team management is done in a separate view (join a team, leave a team). Forms now use Bootstrap theme by default.