Frontend: Localize URLS

[nielsmaerten]

Description

This PR appends the full i18n code (en-US, es-ES, nl-NL, ...) to urls for FAQ, privacy and terms.
It also updates the 'contribute translations' url to https://pages.glucocheck.app/translations

Motivation and Context

• Urls on the homepage should point to docs in the user's own language
• Candidate translators used to be pointed to CrowdIn without any further explanation. Now they see a page explaining the process we follow when translating. This is just an attempt to communicate more clearly

How Has This Been Tested?

• Tested on Nightly

Types of changes

• New feature (non-breaking change which adds functionality)

Checklist:

• I've made my changes in a separate branch
• My change is passing new and existing tests

[codecov]

Codecov Report

Merging #155 (e3d1b7e) into main (d0436ec) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #155   +/-   ##
=======================================
  Coverage   95.20%   95.20%           
=======================================
  Files          52       52           
  Lines         959      959           
  Branches      192      192           
=======================================
  Hits          913      913           
  Misses         45       45           
  Partials        1        1           

Impacted Files	Coverage Δ
gluco-check-frontend/src/App.tsx	100.00% <ø> (ø)
...luco-check-frontend/src/components/Boilerplate.tsx	100.00% <ø> (ø)

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