pt_BR: fix translation error

"agora" means "now"; "gora" is not a Portuguese word.

\a is 'bell' character, which means the string will cause a bell to
sound instead of printing the correct word.
1 job for fix-pt_BR-po in 1 minute and 47 seconds
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Status Job ID Name Coverage
  Test
passed #75384469
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00:01:47