[fix] RSS Feeds don't validate / W3C #384
[add] display last check of wallabag release
[fix] #115 cookie lifetime was empty
[change] ignore tmp files in HTML purifier
updated german localization
added missing german localization strings
Merge pull request #524 from kevmeyer/dev

updated german localization
[fix] links for firefox / android / ios apps
[fix] remember scroll position for baggy theme #519
Merge pull request #531 from mariroz/upload-file

getPageContent moved to Tools, fix of #426
Merge pull request #532 from wallabag/upload-file

New import system
fix of #530 - import fail from Poche