[spellchecker] double dash in msgids

[Davide Viti <zinosat@tiscali.it>]

Hi,
following #432339 I've added a new check:
string starting with "-- " or ending wih " --" should be followed
by a msgstr behaving the same way.

Frans and Christian have just fixed po files.

regards,
Davide

PS: next run of the spellchecker will happen tomorrow around 11am UTC

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