[imp][32413] Show Content title in Page Navigation. Closes #3727
[bug][33760] JEditor errors on addCustomTag() call when using raw document. Fixes #3716
Merge branch 'staging' into 3.4-dev
Adding pt-PT installation language
Updating si-LK installation lang file
[bug][34050] Change message type to 'error' when delete fail JControllerAdmin. Fixes #4042
[bug][33423] Fixing onContentPrepareForm for multilang sites. Fixes #3238
[bug][34044] xcache not working under J3.3.3. Fixes #4083
[bug][34028] Fixed PHPMailer with attachment(s). Fixes #4053
Updated PHPMailer from v5.2.6 to v5.2.8
[bug][34055] Version button unavailable in some cases. Fixes #4030
[bug] Wrong filename detection of Content-Disposition with ending semicolon. Fixes #4025
[imp][#33954] Automatic loading of all TinyMCE templates. Closes #3912
Alpha ordered language strings from previous commit.
[34057] html characters are escaped in check-out tooltip
adding ENT_QUOTES
Removed leftover comment

As of comment in https://github.com/joomla/joomla-cms/pull/3918#issuecomment-51753040
[bug][34058] Wrong css-class in user-registration tooltip. Fixes #4094
[bug][32568] JoomlaUpdate fails if remember me plugin is enabled. Fixes #3467
Merge pull request #4093 from infograf768/checkin

[#34057] html characters are escaped in check-out tooltip
Updating TinyMCE pt-PT.js lang file