Implementing custom URLs for legal notice and privacy policy

[AndreasThum]

Fixes #234

Type (Highlight the corresponding type)

• Bugfix
• Feature
• Documentation
• Refactoring (e.g. Style updates, Test implementation, etc.)
• Other (please describe):

Checklist

• Code updated to current masters head
• Passes CI checks
• Is a part of an issue
• Tests added for the bugfix or newly implemented feature, describe below why if not
• Changelog is updated
• Documentation of code and features exists

Changes

• Customization options for legal notice url and privacy policy url in UI and .env (LEGAL_NOTICE_URL, PRIVACY_POLICY_URL)
• Breaking: Legal notice url and privacy policy url internationalisation

Other information

none

[codecov]

Codecov Report

Base: 96.19% // Head: 96.20% // Increases project coverage by +0.01% 🎉

Coverage data is based on head (b26c99e) compared to base (84afae4).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #261      +/-   ##
============================================
+ Coverage     96.19%   96.20%   +0.01%     
- Complexity      743      745       +2     
============================================
  Files           190      190              
  Lines          2839     2848       +9     
  Branches        246      248       +2     
============================================
+ Hits           2731     2740       +9     
  Misses          107      107              
  Partials          1        1              

Impacted Files	Coverage Δ
app/Http/Requests/UpdateSetting.php	100.00% <ø> (ø)
resources/js/views/settings/Application.vue	100.00% <ø> (ø)
.../Http/Controllers/api/v1/ApplicationController.php	100.00% <100.00%> (ø)
app/Http/Resources/ApplicationSettings.php	100.00% <100.00%> (ø)
resources/js/components/FooterComponent.vue	100.00% <100.00%> (ø)

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