Replace :before with :after

The sort arrow being right, it makes more sense to use pseudo-element after
Merge pull request #2535 from roukmoute/patch-2

Replace :before with :after
Replace validateValue by validate in inline edit
better presentation of demo login
updated german translations
Merge pull request #2550 from OskarStark/patch-2

updated german translations
Merge pull request #2549 from OskarStark/patch-1

better presentation of demo login
Merge pull request #2548 from EmmanuelVella/list-editable-validate

Replace validateValue by validate in inline edit
set headlines for "demo" and "documentation"
Merge pull request #2555 from OskarStark/patch-3

set headlines for "demo" and "documentation"
fix floating check with label for firefox
Merge pull request #2556 from juherpin/fix-floating-label

Fix floating check with label for firefox
- update documentation & fix typos
Merge pull request #2565 from nicolasricci/master

- update documentation & fix typos
Nano - simple quotes vs double quotes

simple quotes vs double quotes
Merge pull request #2566 from cbastienbaron/patch-1

Nano - simple quotes vs double quotes