Workbench Tabs (8.x-1.3) - en to unknown language translation catalogue (5 entries)

en: Error message
target: Feilboð

en: Warning message
target: Ávaringarboð

en: Primary tabs
target: Fyrstu spjaldur

en: Secondary tabs
target: Næstu spjaldur

en: Status message
target: Støðuboð
