marine for both #697 and #735

changelog for 50m, 110m marine

#735 marine area remastering

bump to v5.2.0-pre

fix #736 St Helena wikidata id and name translations

mapshaper churn

Londonderry/Derry localizations for disputed place

v5.1.2

bump for v5.1.2

add missing fclass_tlc column

v5.1.1 DBF var char length fix

ensure non-zero length strings (upgrade mapshaper)

set longer text field format on fclass_*

Merge pull request #713 from nvkelso/nvkelso/city-name-fixes

v5.1.0 packaging