Use ngIf for globalSettinsPanel
Smoother transition for globalSettingsPanel
Fix allMessages panel

Trigger it through a directive, make use of ngIf, smoother transitions.
Same ngIf strategy for helpPanel
Wrap uservoice in a uservoiceTrigger directive

Fixes #391
Use consistent naming across directives
Add arethusaGenerator

Code generators directives that appear more than once.
Use arethusaGenerator for all panel triggers
Refactor panel triggers for speed
Highlight trigger when panel is open

Fixes #389
Refactor panelTrigger

We don't need to set the title on parent anymore - that's was an issue
a very long time ago, when the element was the icon itself.
Extract history directives to arethusaGenerator
Remove obsolete translations
Merge pull request #394 from latin-language-toolkit/panel_optimizations

Panel optimizations, navbar buttons and directives refactor - arethusaGenerator