Fix repeated word in pt_BR translation

Asherah Connorrequested to merge
push-lszvroqxkupm into master

What does this MR do and why?

The Brazilian Portuguese translation of "started a thread on an old version of the diff" reads:

image

@GitLabDuo iniciou um tópico tópico em uma versão antiga do diff

"tópico" is written twice.

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