Correcting a little error on pt-BR.po

[Gabriel-Sousa-Amorim]

Hello Everyone!
Correcting little error, that do not translate to Brazilian Portuguese in po/pt-BR.po, adding a sentence in the end of the string for correct translation...

--- msgid "This segment should take about 15 minutes"
--- msgstr "Este segmento deve durar cerca de 15 minutos"

+++ msgid "This segment should take about 15 minutes. It contains:"
+++ msgstr "Este segmento deve durar cerca de 15 minutos. E possui:"

The correction is related with the following issue:

#2777

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[Gabriel-Sousa-Amorim]

Hello,
I added more corrections for translating all remaining similar messages that were not translated yet.

[djmitche]

The CI suggests looking at https://github.com/google/comprehensive-rust/blob/main/TRANSLATIONS.md#creating-and-updating-translations -- I think there's a bit more to do here?