Merge branch '1170-hilfe-in-leichte-sprache' of https://gitlab.metager.de/open-source/MetaGer into 1170-hilfe-in-leichte-sprache

# Conflicts:
#   metager/resources/less/metager/pages/help.less
#   metager/resources/views/help/help-privacy-protection.blade.php
#   metager/resources/views/help/help-services.blade.php

Resolve "fixing the back button icon for the language selection page"

Closes #1231

See merge request !2017

# Conflicts:
#   metager/lang/en/help/help-mainpages.php
#   metager/lang/en/help/help.php
#   metager/resources/less/metager/general/base.less
#   metager/resources/views/help/help.blade.php
#   metager/webpack.mix.js

Resolve "Prevent white flashing page when resultpage is loaded"

Closes #1226

See merge request !2015

Resolve "Reduce server wait times for BV"

Closes #1225

See merge request !2014