i18n'ed mailsender page.
i18n'ed members pages.
i18n'ed wiki pages.
Merge commit '192d08dfda81a8e6cbe797e60f0de5513fcff921'

Conflicts:
	locales/translation-de.json
	locales/translation-en.json
i18n'ed waitinglist page.
i18n'ed some of the general pages.
Wiki test now uses testHelper.createApp.
Merge commit 'f2a24cfe7be5b32ce7e8bec83d45485dae2dfb3e'
Text changed slightly.
i18n'ed activities pages.
Merge pull request #537 from NicoleRauch/master

Internationalization :-)