removed unused lang string (authmodfailed)

Fix CodeSniffer violations

Remove whitespace from end of lines to reduce the number of CodeSniffer
violations.

added aria attributes to edit mode

FS#2751 - self deletion of user account

Language files: insignificant fixes

Added diff navigation
Navigation links to move to previous edit before revision in left column or next/last edit after revision in right column.

link directly to subscription management in mails

This was updated in the english translation a while ago, but was still
missing in some translations

added option to enable automatic popularity data in installer

Re-phrased "no license" installer text

changed semicolon to colon in link to welcome page to make it less confusing

improved grammar in preview text (FS#2614)

Use hardcoded plugin loading error message as $lang isn't initialized

When loading plugins, $lang might not be initialized yet, so use a
hardcoded error message instead, especially as this error sho

Use hardcoded plugin loading error message as $lang isn't initialized

When loading plugins, $lang might not be initialized yet, so use a
hardcoded error message instead, especially as this error should only be
displayed for the admin (and then fixed). This also removes the
previously localized message, it might be re-added as part of the new
extension manager.

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Translatable string for "None" license selection

The position of the option was moved to the end of the list so
the English label "None of the above" will make sense.

reworded the word 'button' to be more generic and independent from template (FS#2543)

fixed validation errors in the installer

changed the link in the installer to point to wiki:welcome

added lang string for 'Sidebar'

Restore page versions - add timestamp of the restored version to to the summary field.
This allows easier identifying of which version has been restored. (FS#2522)

display uploadable file size in media manager FS#2425

fixed subscriber mail signatures

removed footer image from HTML mails

do not hardcode profile link in AD pass expire message

Changing passwords might not be available.

added 5 new language strings for action tools and skip link (needs translations)

This is in preparation for the new default template. This also updates the tpl_actiondropdown() to use most of them.

corrected old mediaupload introduction text

localization: removed strings from old flashuploader