This test is horrible, but I believe necessary to ensure that the
@import of less files actually works.

It is horrible as its not a unit test and its not a true functional
test.  It probably implies the code in css_out() should be refactored
to make it easier to test intermediate results.

- use TMP_DIR constant rather than /tmp
- swap order of parameters in csstest() to match reported 'expected' & 'actual'
- add tests for use of 'url()' in @import
- add tests for @import of '.less' files (these test will fail per FS#2875)

This reverts commit 88833bac.
and fixes FS#2874

Localize some meta header titels. Fixes FS#2409

Translation update (eo)

Translation update (ar)

FS#2867, ACL processing may fail with utf-8 characters which include byte 'A0'.

Fix issues from teams:i18n:translation-check in localizations

Translation update (nl)

Translation update (zh)

Translation update (tr)

Translation update (da)

Translation update (da)

Translation update (he)

Translation update (da)