Fix english mail generation on fresh install

Reapply changes from PR switching on PHPSpreadsheet

&= prevents result to be a boolean

Fix translation catalogue

Fix "14_discount/3_check_vouchers_in_FO" in full campaign

Force default theme when config is empty to generate emails on fresh install, fix warning in Mail::send

Simplify the installation language to its minimum

Fix carrier display in order confirmation email

Extend customer page

Avoid bug when creating manually created a language

Update facetedsearch cache

Update to Faceted search 3.0.5

Fix download in E2E tests

Cannot use accented URL with arabic language

Add getter for current locale

Introduce the usage of Module user-displayable exceptions to handle module errors (part 2)

Fix broken tests

Fix test Module '04_sort_module' in suite full