Move User and Group displays into a macro
XWIKI-10975: A newly created translation document should not be injected into the context
XWIKI-10905: The "Search" field is not well displayed on ie8.
XWIKI-10775: LESS compiler fails to compute Flamingo's CSS if a document called Main.flamingo exists.
[Misc] Better comment on a translation page.
XWIKI-10921: Empty breadcrumb is shown when exporting in HTML the home page with Flamingo.
XWIKI-10977: Introduce an "auto" value for the "align" option of the Suggest widget.
XWIKI-10584: Search suggest doesn't work on mobile for subwikis.
XWIKI-9813: Merge conflict when creating a subwiki and adding some members.
XWIKI-10915: Use a monospace font when displaying textarea content in wiki mode.
[Misc] Better comment
[Misc] Apply coding style.
XWIKI-10866: New password warnings overlap.
XWIKI-10980: The "Install new applications" button doesn't work anymore.
XWIKI-10987: Upgrade to JGroups 3.5.0
[Misc] Avoid NPE which can now happen after the fix for (XWIKI-10976: XE doesn't stop if there's a failure during the PersistentTestContext initialization)
XWIKI-10905:  The "Search" field is not well displayed on ie8.

* Adding hidden text that screen readers can read.
XWIKI-10994: The grip for the scrollbar of the TreeView is not centered
[misc] Avoid generating useless exceptions
[build] Fixed tests.
- Negative yoffsets work only when moving before a field that is not the top field. Using 0 yoffset works both for moving before top fields and also before lower ones.
- xoffset seems to work fine with a value of 0, so I also removed the comment saying it doesn't.
[build] Fixed tests.
- Same as before for drag&drop. Using 0 for xoffset this time.