* add disableEscape parameter to disable this functionality
* drop usage of escapeHTML() that is now done inside t()
* add unit test for escaped and not escaped placeholder
* proper JSDoc
Added addTranslations and fixed de.js file
Fixed de.js to use OC.L10N.register() and use to correct expected
format.
Added JS unit tests for OC.L10N class
Include translations JS script for all apps