[ticket/8228] Fix whitespaces before code in Firefox

Based on the "[code] enhancements" modification by TerraFrost

PHPBB3-8228
[ticket/11638] Variable names goof...

sub-task of ticket PHPBB3-11635:
find and fix all bypasses of generate_text_for_*

PHPBB3-11638
Merge pull request #1630 from brunoais/ticket/11638

[ticket/11638] Variable names goof...
Merge branch 'develop' of https://github.com/phpbb/phpbb3 into develop

# By Bruno Ais
# Via Bruno Ais (1) and Joas Schilling (1)
* 'develop' of https://github.com/phpbb/phpbb3:
  [ticket/11638] Variable names goof...
[ticket/8228] Fix still existing problems with code in firefox

A user of a board mentioned that there are still some problems
in firefox if php-highlighting is on. So I used a snippet which
they worked on for weeks. Link to the snippet (in german):
http://www.ongray-design.de/forum/viewtopic.php?t=541

PHPBB3-8228
[ticket/11757] Fix typo in signature_module_auth migration

PHPBB3-11757
Merge remote-tracking branch 'Elsensee/ticket/11757' into develop

# By Oliver Schramm
# Via Oliver Schramm
* Elsensee/ticket/11757:
  [ticket/11757] Fix typo in signature_module_auth migration
Merge remote-tracking branch 'Elsensee/ticket/8228' into develop

* Elsensee/ticket/8228:
  [ticket/8228] Fix still existing problems with code in firefox
  [ticket/8228] Fix whitespaces before code in Firefox