Update translations from transifex release-2.x.y

Clean changed translations release-2.x.y

Some stuff got missed when making internal.h libpurple only.

Merged in default (pull request #690)

Add since tag to the purple_blist_get_default_group_name docs

Make sure we're not including the gettext macros in header files and deal with the repercussions of that.

Move common_sockaddr_t back to purpleprivate.h and ignore purpleprivate.h from the docs.

Make sure that internal.h can only be included by libpurple and split out some pieces to purpleprivate.h

closing merged branch Ball--Gy-rgy/update-screenshot-url-in-appdata-file-1591293245974

Merged in Ball--Gy-rgy/update-screenshot-url-in-appdata-file-1591293245974 (pull request #704)

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