Since 3.5.0 Libreoffice is not localized anymore as it seems. The l10n package using "de" locale (linguas_de) does not contain any files, so the obly available UI-Language in LO is English. [ebuild R ] app-office/libreoffice-l10n-3.5.0-r3 USE="-offlinehelp -templates" LINGUAS="de -af -ar -as -ast -be -bg -bn -bo -br -brx -bs -ca -ca_XV -cs -cy -da -dgo -dz -el -en -en_GB -en_ZA -eo -es -et -eu -fa -fi -fr -ga -gd -gl -gu -he -hi -hr -hu -id -is -it -ja -ka -kk -km -kn -ko -kok -ks -ku -lb -lo -lt -lv -mai -mk -ml -mn -mni -mr -my -nb -ne -nl -nn -nr -nso -oc -om -or -pa_IN -pl -pt -pt_BR -ro -ru -rw -sa_IN -sat -sd -sh -si -sk -sl -sq -sr -ss -st -sv -sw_TZ -ta -te -tg -th -tn -tr -ts -ug -uk -uz -ve -vi -xh -zh_CN -zh_TW -zu" 0 kB [ebuild R ] app-office/libreoffice-3.5.0.3 USE="branding dbus graphite gtk java jemalloc mysql nsplugin opengl pdfimport postgres svg vba webdav xmlsec (-aqua) -binfilter -debug -eds -gnome -gstreamer -gtk3 -kde -odk -test" 0 kB
Already fixed, see libreoffice-l10n-3.5.0-r4.