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.
translate custom empty text
Update Authors file.
Merge branch 'enh-art-replyto-master' of github.com:dietmarb01/otrs
Fixed: Postmaster incorrectly decodes headers, causes garbage in the database (bug#10085).
Unit tests for EncodingIsAsciiSuperset and FindAsciiSupersetEncoding
Added possibility to display tickets with thousands of articles, thanks to Moritz Lenz @ noris networks.
GUI improvements pending.
Squashed commit of the following:

commit 7beb415abeedbb17976b7c7193d3f4f9141daee4
Author: Moritz Lenz <mlenz@noris.net>
Date:   Fri Feb 21 11:08:24 2014 +0100

    Tests for ArticleContentIndex

    in particular for the new Limit and Page options

commit ac71fe14bb22ab72a45f19b2a5b8d0a571b79ec4
Author: Moritz Lenz <mlenz@noris.net>
Date:   Fri Feb 21 10:45:45 2014 +0100

    remove obsolete TODO comment

commit 2b1b5e64d882c5577df03da6cfd3e7e43c1b0b53
Author: Moritz Lenz <mlenz@noris.net>
Date:   Tue Feb 18 17:52:54 2014 +0100

    use heading

commit 48dad2c1a821fe220f3d624931d8003c766ede42
Author: Moritz Lenz <mlenz@noris.net>
Date:   Tue Feb 18 15:40:23 2014 +0100

    Unit test for ArticleCount

commit 29b1e5b167a0ee2d38fdcef08b91bf9edb226c34
Author: Moritz Lenz <mlenz@noris.net>
Date:   Tue Feb 18 14:59:51 2014 +0100

    Cleaner HTML, even it does not look as pretty

commit ebfbf1fe4cf0d00e308f29ade1f3ebe5d58f3b9a
Author: Moritz Lenz <mlenz@noris.net>
Date:   Tue Feb 18 14:21:02 2014 +0100

    Make article limit for ZoomExpand configurable

commit c551b6689e9354275693d86435492f1800b9f6a6
Author: Moritz Lenz <mlenz@noris.net>
Date:   Tue Feb 18 14:16:01 2014 +0100

    Bump limit to 1000

commit 0c2260a039c4825b8ff52681d27e14292d321cc6
Author: Moritz Lenz <mlenz@noris.net>
Date:   Tue Feb 18 14:15:47 2014 +0100

    Add page number to ZoomExpand links

commit f218741d7baddf08e4704e7026fd3ab71ad055ce
Author: Moritz Lenz <mlenz@noris.net>
Date:   Tue Feb 18 13:40:21 2014 +0100

    First shot at actual pagination in AgentTicketZoom

commit 6b8a3594eb2271092cc5f007c9584be74115a02a
Author: Moritz Lenz <mlenz@noris.net>
Date:   Tue Feb 18 11:17:44 2014 +0100

    Limit list of articles on AgentTicketZoom

    TODO: show pagination

commit 42644fd2a3e70cd4905018be036a3ef47239562e
Author: Moritz Lenz <mlenz@noris.net>
Date:   Tue Feb 18 09:05:08 2014 +0100

    Infrastructure for paged article boxes

    Implements Limit and Page parameters for ArticleGet and ArticleContentIndex.
Fixed: Problem with encoding in attachment (bug#10275).
Squashed commit of the following:

commit d953a1c0a29afe2e2f36d717cd983a7cbe86e52b
Author: s7design <otrs@s7designcreative.com>
Date:   Thu Mar 6 18:49:56 2014 +0100

    Fixed for all versions IE (8-11)

commit ae2e4e70f7419406abd6b7facecbe3f6b607858e
Author: s7design <otrs@s7designcreative.com>
Date:   Wed Mar 5 22:26:49 2014 +0100

    [Bug 10275] Problem with encoding in attachment

    Added code for encoding unicode filename in attachment in IE (up to version IE 10)
Fixed: Line breaks at the end of salutation templates are not saved (bug#9951).
Squashed commit of the following:

commit 49a1f3f9e5040598950f3d990659190141a6cbfa
Author: s7design <otrs@s7designcreative.com>
Date:   Fri Mar 7 14:07:05 2014 +0100

    Sorry, I  hurried and made mistakes in previous commits. I hope it is well and really final solution.

commit 9137d5869bb0c87015b3227899d9909649d7c07a
Author: s7design <otrs@s7designcreative.com>
Date:   Fri Mar 7 13:55:28 2014 +0100

    final version of fixing with all changing

commit dd2d489c1aa6bf8fe66d20709c57bdf7b1d31265
Author: s7design <otrs@s7designcreative.com>
Date:   Fri Mar 7 13:49:37 2014 +0100

    Changed with better solution

commit 4939858ae91c9a4afbe7910c8f0caa44738d9f2e
Author: s7design <otrs@s7designcreative.com>
Date:   Wed Feb 26 01:17:40 2014 +0100

    Chenged

commit cbb170582d695e7b79350704a0d1044e185d0d0d
Author: s7design <otrs@s7designcreative.com>
Date:   Wed Feb 26 01:16:48 2014 +0100

    Removed Templete/Text from the loop and assign it afterwards

commit a155a83c91d861be5089da5fef28f38992791268
Author: s7design <otrs@s7designcreative.com>
Date:   Tue Feb 25 15:23:23 2014 +0100

    [Bug 9951] Line breaks at the end of  templates are not saved

    Fixed this bug for signatures and templates fields.

commit 02a9ab0b734adc654c7e8f1883f87c4a64619ea0
Author: s7design <otrs@s7designcreative.com>
Date:   Tue Feb 25 13:30:21 2014 +0100

    [Bug 9951] Line breaks at the end of salutation templates are not saved

    Added argument Raw => 1 in function GetParam for parameter of AdminSalutation module.
    With this is deactivated trimming trailing/leading whitespace.