Remove localization, set english as default

[wouterbles]

Removes localizaton (texts) feature from the website. Makes it easier to keep content uptodate and decreases complexity of the codebase.

• This also adds migrations to set the EN value from the texts table to the original column that had referenced the texts table by foreign key
• Migrations have been tested locally with production version of the database and work correctly
• Removes most of the 'lang' files, as these had very inconsistent translations and replaced the trans() instances to the actual vaules

[codecov]

Codecov Report

Merging #348 (d56faee) into master (8890c73) will decrease coverage by 3.99%.
The diff coverage is 24.04%.

❗ Current head d56faee differs from pull request most recent head 0f66f1a. Consider uploading reports for the commit 0f66f1a to get more accurate results

@@             Coverage Diff              @@
##             master     #348      +/-   ##
============================================
- Coverage     35.10%   31.12%   -3.99%     
+ Complexity      561      526      -35     
============================================
  Files            87       80       -7     
  Lines          2162     1960     -202     
============================================
- Hits            759      610     -149     
+ Misses         1403     1350      -53     

Files	Coverage Δ
app/Console/Commands/RemoveOldApplications.php	100.00% <100.00%> (ø)
app/Console/Commands/RemoveOldUsers.php	100.00% <100.00%> (ø)
app/CustomClasses/MailList/MailListMember.php	0.00% <ø> (ø)
app/Http/Controllers/PendingUserController.php	81.25% <100.00%> (ø)
app/Http/Middleware/Authorize.php	100.00% <100.00%> (ø)
app/Http/Requests/ApplicationFormStoreRequest.php	100.00% <100.00%> (ø)
app/MenuItem.php	27.58% <ø> (-6.70%)	⬇️
app/Models/ApplicationForm/ApplicationForm.php	100.00% <100.00%> (ø)
app/Models/ApplicationForm/ApplicationFormRow.php	100.00% <ø> (ø)
app/Models/ApplicationForm/ApplicationResponse.php	50.00% <ø> (ø)
... and 67 more

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