Fix/apply button header

[Gunvor4]

Proposed changes

Translates the apply button in the English header

Areas to review closely

Checklist

(If any of the points are not relevant, mark them as checked)

• [x] Remembered to run the makemigrations, makemessages and compilemessages management commands and committed any changes that should be included in this PR
• [x] Created tests that fail without the changes, if relevant/possible
• [x] Manually tested that the website UI works as intended with different device layouts
  • (Most common is to test with typical screen sizes for mobile (320-425 px), tablet (768 px) and desktop (1024+ px), which can easily be done with your browser's dev tools)
• [x] Manually tested that everything works as intended when logged in as different users locally
  • (This can be e.g. anonymous users (i.e. not being logged in), "normal" non-member users, members of different committees, and superusers)
• [x] Made sure that your code conforms to the code style guides
  • (It's not intended that you read through this whole document, but that you get yourself an overview over its contents, and that you use it as a reference guide / checklist while taking a second look at your code before opening a pull request)
• [x] Attempted to minimize the number of common code smells
  • (See the comment for the previous checkbox)
• [x] Added sufficient documentation - e.g. as comments, docstrings or in the README, if suitable
• [x] Added your changes to the "Unreleased" section of the changelog - mainly the changes that are of particular interest to users and/or developers, if any
• [x] Added a "Deployment notes" section above, if anything out of the ordinary should be done when deploying these changes to the server
• [x] Structured your commits reasonably
  • (Some tips on this can be found in "Write Better Commits, Build Better Projects" and in the code style guides)
  • (Restructuring commits after they've already been committed, can be done using e.g. interactive rebase; see the Git docs on rewriting history)

[codecov[bot]]

Codecov Report

Merging #687 (d0129a0) into main (91ec51b) will not change coverage. Report is 13 commits behind head on main. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #687   +/-   ##
=======================================
  Coverage   88.16%   88.16%           
=======================================
  Files         152      152           
  Lines        6187     6187           
=======================================
  Hits         5455     5455           
  Misses        732      732