[l10n] Update Greek translation
Updated Dutch translation
Merge pull request #371 from MRIG/master

local cache po up menu to  summarily
lua : fix incorrect unstacking after call
FIX: es.po 234 fuzzy translations, 83 untranslated messages.
Merge pull request #372 from jinxos/gr_translation

[l10n] Update Greek translation
Merge branch 'master' of https://github.com/darktable-org/darktable