Allow update of "ReplyTo" in article

"ReplyTo" (if present) overrides "From" when it comes to route a response
from OTRS, so it should be updateable as well to stay in control.

Added test cases for ArticleUpdate.
Fixed unit tests. Made LayoutObject OM-aware.
Improved UT encapsulation.
Typo.
Fixed: Error in AdminPostMasterFilter if the name of DynamicField changed (bug#10328).
Squashed commit of the following:

commit 2117dfcfa42e98fd0b9d85907048426ec752ba1b
Author: Norihiro Tanaka <noritnk@kcn.ne.jp>
Date:   Thu Mar 6 21:23:52 2014 +0900

    Fix bug#10328.
Squashed commit of the following:

commit 96604a5ddc71dad2ffba62416257687b6622dd18
Author: Nils Leideck <nils.leideck@leidex.net>
Date:   Tue Mar 4 01:51:55 2014 +0100

    Changed Kunden-ID to Kundennummer.

commit 67b3d554fd2741b6232aec27870af37a48e09efa
Author: Nils Leideck <nils.leideck@leidex.net>
Date:   Mon Mar 3 23:08:05 2014 +0100

    Removed the term 'Company' from config and language files.
Fix test failures caused by $_ clashes

both UnitTest->new and Kernel::Config::Default used $_, causing the
tests in UnitTest.t to abort.

This commit introduces lexical variables instead in both places,
as well in ObjectManager
Merge branch 'evil-dollar-underscore' of github.com:moritz/otrs
Fixed: Problem with symlinked theme directories (bug#10336).
Avoid the use of ../ to allow for symlinking theme subdirectories

Conflicts:
	Kernel/Output/HTML/Layout.pm
The name of the Queue should not be translated.
For example a Queue named "Order" get's translated to "Sortierung"
Merge branch 'queuename' of github.com:hanneshal/otrs
translate custom empty text
Update Authors file.
Merge branch 'enh-art-replyto-master' of github.com:dietmarb01/otrs
Merge remote-tracking branch 'upstream/master' into otrs-master