removed deprecated third param of cleanID()
removed loading of deprecated RTL styles
removed deprecated tpl_getFavicon()
removed deprecated html_attbuild()
removed deprecated images
deleted wrongly added file
deleted another wronlgy added file
Revert "deleted wrongly added file"

This reverts commit 9b47ccb8d0bb02c6f5a7a67d261a43f0fd31413c.
Improve css_loadfile() tests
- 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)
add DOKU_INC to less import directories
update url/file rewriting in css_loadfile() to support @import of less files
additional tests where for relative path to @import less file
Test to ensure less can parse the @import rewritten by css_loadfile()

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.
added possibility to approve users to ACL policies in installer
changed how to approve users in installer ACL policy
removed redundant line
fix sp. in comment
refactor to improve elegance
translation update
translation update