Visualization refactoring

trying to use some hooks for visualization, properties are now handled in request/view data objects without any logic, not sure if it works, still an experiment, probably does not work for custom visualization properties

automatic translation update

(some tests failing)

- method to fetch new translation files from oTrance
- method to fetch files and create a pull request
- helper methods to show available language names/codes
- method to show all translation keys that are used anywhere within the code
- method to list all plugins that contain their own language files

the if condition seems to be buggy, do not set dataTable null in case one is defined, also added hook where we can prepare all the viz view stuff