update lsl
update de translation (fix #1487)
fix error message about non-existent submodules
fix #1697
Merge branch 'master' of git://github.com/renemilk/springlobby

Conflicts:
	src/lsl
don't create torrents/downloads dir as its not used any more by pr-downloader
adds forgotten headercheck template file
update pr-downloader: fix 1698:
don't install any pr-downloader file
Merge remote-tracking branch 'koshi/master'
add option header_check
update pr-downloader
update translations only when required
cleanup cmake "update-translations"
update translations
update lsl
always create translations
made headercheck target optional & remove option HEADER_CHECK
fix #1700
gentoo has <sourcedir>/springlobby_config.h from tarball but tries to include  non-existing <binarydir>/springlobby_config.h
bump lsl to latest
Merge branch 'master' into usync_to_lsl