Merge pull request #262 from piwik/translationupdates

[automatic translation update] Updated 251 strings in 9 languages (da, de, el, es, it, nb, ro, sr, sv)
Refs #4768 Revert this change as it does not work perfect yet.
Merge branch 'master' of github.com:piwik/piwik
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Removing unused postTestEvent
Refs #5004 Remove the "login" override when setting a user as super user.
Let's see if any test or screenshot test fails
Refs #4768 Revert test also
fix Archive*Test
UI test fixtures need OverrideLogin
Display errors without html entities
Fix password reset
sm
Fix notice: Notice: Undefined index: in plugins/Events/Events.php on line 92
 Fixes #4999 Add mbstring to the list of "required extension" in the system check
Refs #5004 remove unused code
Fix double encoding
system check now shows mbstring as required
Last RC :) 2.2.0-rc4
2.2.0 final
This failed once after a lunar eclipse