mark the start of 2.18 development

set version 2.17 for release

remove old Skosmos 2 Twig templates

update German & Northern Sámi translation + English language template…

… from Transifex

(cherry picked from commit 2d960ca)

mark the start of 2.17 development

set version 2.16 for release

mark the start of 2.16 development

set version 2.15 for release

mark the start of 2.15 development

Merge pull request NatLibFi#1287 from NatLibFi/fix-content-top

Replace #concept-info-before div element with more generic #content-top