[Translators] schedule for next release (3.13.0)

[Luigi Votta]

Hello,

it.po, is 100% translated. The previous version has been all
reviewed trying to use words uniformity, fixing typos and translating
a sufficient number of untranslated msgid.

Typo fixes of Trek have been included.

Here is the link to file:
https://lewis41.fedorapeople.org/claws-mail_3.12.0git99/

Greetings
Luigi
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