[Translators] some typos in source

[Genghis Khan]

There is a whitespace before "..." (msgid_plural)

#: src/mbox.c:144
#, c-format
msgid "Importing from mbox... (%d mail imported)"
msgid_plural "Importing from mbox ... (%d mails imported)"
msgstr[0] ""
msgstr[1] ""

http://git.claws-mail.org/?p=claws.git;a=blob;f=po/en_GB.po;h=03f5119edb0b41658d421c42d7acec75cf24c7a2;hb=HEAD#l7222

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