Merge pull request #366 from kripton/german

Update german translation
UI: better solution for buttons background.

The Cleanlooks style doesn't exist on Qt5 anyway
New fixtures: Stairville LED Flood Panel 7x3W, Clay Paky Alpha Wash 700 (thanks to Robert Scheffler)
Release version 4.8.1.

Updated Show Manager documentation
Fixed 4.8.1 changelog date
Dutch translations
Matrix editor: Fade out time is not included in Duration
(found by Giorgio, analysis David Garyga, fix Jano Svitok)
Merge pull request #367 from joepadmiraal/Dutch_translation

Dutch translations update
New fixtures: NJD Spectre, Chauvet Eclipse RGB (thanks to Charles Oldham)

Version bump to 4.8.2 GIT
New fixtures: American DJ Dotz TPar, Abstract Twister 4 (thanks to Charles Oldham)
New fixture: American DJ Galaxian Sky (thanks to Chicken)
New fixtures: Cameo Strobe 3x3.5W, Cameo Strobe 6x10W (thanks to Janosch Frank)
New fixture: Stairville HL-x9 Quad Color Flood 9x8W (thanks to Janosch Frank)
New fixture: American DJ Inno Pocket Scan (thanks to George Qualley)
New fixture: Stairville LED PAR56 10MM-UV (thanks to Hadley Denton)
Conversion of webaccess HTML strings to UTF.
Removed illegal attribute language from HTML script tag.
Making XHTML valid to standard.
Speed up things in running chasers

Scene: Use a map instead of a list (way faster search, auto sorting)
Doc: Do not search two times in the fixture map when fetching a fixture
New fixture: Pulse ECO LED PAR56 (thanks to Charles Oldham)