CSS Twerks

Un-uglifying the required/invalid input state (now uses red border and
font awesome icon)
Adjusting x-panel table header hue (to $darkNeutral)
removing legacy green buttons in package manager (now $primary)
retina-tizing x-btn-split (Download Extras button)
uberbar result hovers (%nav-item)
Help Page Improvements

Retina CSS MODX Help Logo
Primary Action styling on sign up button
Fix error with package management caused by #691
Add preg_quote to friendly_alias_word_delimiters characters

This allows you to add / as a friendly_alias_word_delimiter without breaking the regex
Corrected some German phrases

Minor changes, mostly concerning formatting
Corrected two phrases in German setting.in.php

Somehow I got this mixed up...
Merge branch 'develop' into german_translation

Conflicts:
	_build/templates/default/sass/_colors-and-vars.scss
	_build/templates/default/sass/_utility.scss
	core/docs/changelog.txt
	manager/templates/default/css/index.css
Translated new phrases to German
Translated new phrases to German and corrected some old ones

* origin/pr/11133:
  Translated new phrases to German
  Corrected two phrases in German setting.in.php
  Corrected some German phrases