LB-545: Embed URL crashes if a user who has published posts is deleted
* some initial overwriting
Merge branch 'devel' into lb-545-user-retirement
LB-545: Embed URL crashes if a user who has published posts is deleted
* adjusting
LB-545: Embed URL crashes if a user who has published posts is deleted
* deletion set as inactivation
LB-545: Embed URL crashes if a user who has published posts is deleted
* adjusted
Merge branch 'liveblog-15' into lb-545-user-retirement
LB-545: Embed URL crashes if a user who has published posts is deleted
* adjusted
LB-545: Embed URL crashes if a user who has published posts is deleted
* adjusted the upgrade script
LB-893: Twitter autoupdate does not work on Zeit Demo server (Search, User tabs)

Autoreload if notifications are switched on.
LB-856: The DB-upgrade causes errors if SQLite3 engine is used
* calmed
LB-855: Delete the population of root user
* root user not populated
LB-861: On embed -> user comment, if the first filled captcha text is incorect later it will not accept it even if the correct text is provided

Reload recaptcha on error.
LB-862: After a user message has been sent the "Your message was sent for approval" message is showed for a very short

Close popup only after the message was shown.
Missing internationalization texts
Merge pull request #267 from nistormihai/liveblog-15

Missing internationalization texts
Merge pull request #265 from petrjasek/lb-862-message-short

Lb 862 comment confirm message too short
Merge pull request #264 from petrjasek/lb-861-recaptcha-reload

Lb 861 recaptcha reload
Merge pull request #257 from petrjasek/lb-813-twitter-autoupdate

Lb 813 twitter autoupdate
LB-863: After a blog is closed it should disappear from Live Blog menu
* isOpen filter parameter for blogs
LB-860: On Manage Collaborators -> add new collaborators, it is showed only first 20 collaborators.
* limit-filter added