| This PR refactors a bunch of projects-related code, mostly the
templates.
The following things were done:
  - rename boards to columns in frontend code
  - use the new `ctx.Locale.Tr` method
  - cleanup template, remove useless newlines, classes, comments
  - merge org-/user and repo level project template together
    - move "new column" button into project toolbar
- move issue card (shared by projects and pinned issues) to shared
template, remove useless duplicated styles
- add search function to projects (to make the layout more similar to
milestones list where it is inherited from π)
  - maybe more changes I forgot I've done π 
Closes #24893
After:



---------
Co-authored-by: silverwind <me@silverwind.io> | ||
|---|---|---|
| .. | ||
| list.tmpl | ||
| new.tmpl | ||
| view.tmpl | ||