mini display fix for administration view
Fix for printing activities.
Merge pull request #545 from leider/master

small fixes
Localization for frontend (validators).
Localization of error messages in activities.
Moved two methods from activitiesCoreAPI down to activitystore.
General cleanup:
- Persistence now only returns the error code on save, nothing else
- Stores now only return the error code on save, not the object to be saved
- This simplifies the API save methods.

Also: Removed persistence.saveValueObject + test
Merge pull request #546 from NicoleRauch/master

Letzte Reste Frontend-Lokalisierung + allgemeine Aufräumarbeiten
minor change for localization - merged the translation files
inlined script for toggling checkboxes and button on history page
localizing data tables
one more inlining of dom tree manipulations
Merge pull request #547 from leider/master

localization buzz
changed the color picker component to „pick-a-color“
moment was loaded twice leading to possible incompatibilities, now only using front end’s moment.js
updated build for new color picker
bumped versions of required modules
Merge pull request #548 from leider/master

changed the color picker component to „pick-a-color“
Merge pull request #549 from leider/hotfix

bumped versions of required modules
Merge pull request #519 from holger-s/master

users can now write blog posts for the group page