update Creative Commons licenses to 4.0. fixes #1286

https://wiki.creativecommons.org/wiki/License_versions
https://wiki.creativecommons.org/wiki/Frequently_Asked_Questions#Why_should_I_use_the_latest_version_of_the_Creative_Commons_licenses.3F

Translation update (sk)

Fix the flow of the navigation buttons in user manager

Fixed several undefined errors.

* Fixed identified issue with button spans by replacing missing closing span tag as identified by selfthinker, removed in ae614416.

* Changed the flow of the navigation button HTML so the navigation buttons actually flow to the right.

Translation update (bg)

Translation update (zh-tw)

Translation update (it)

Translation update (it)

Translation update (it)

Translation update (it)

Translation update (it)

Translation update (it)

Translation update (it)

Translation update (it)

Fix Parser Media tests running locally

These tests were passing on travis-ci but failing when run locally because the tests were assuming the value of DOKU_BASE would be '/./' but it was actually '/tmp/' instead.

You now can add labels that don't wrap around inputs, but you have to
ensure IDs are properly assigned yourself.

The Label class has been renamed to LabelElement to reflect the naming
scheme of the other elements.

Revert "Trim unnecessary / at start of windowssharelink"