Change i18n of mint-update on pt_BR

[otavioschwanck]

Describe the bug The "Atualizar" and "Instalar Atualizações" are very similar and can confuse users.

The ideal is change "Atualizar" to "Buscar atualizações"

To Reproduce

1. Open mint-update.

Frequency Does the issue happen:

• [x] Always
• [ ] Randomly

Edition (Desktop environment): In which edition is this happening?

• [x] Cinnamon Edition
• [x] MATE Edition
• [x] Xfce Edition

Live or post-install: Indicate if this is happening after the installation, or during the live session:

• [ ] Post-install
• [ ] Live session

Screenshots

Locale: pt-BR

[NikoKrause]

Please suggest your changes here: https://translations.launchpad.net/linuxmint/latest/+pots/mintupdate/pt_BR/+translate?batch=10&show=all&search=Refresh

[VaGNaroK]

otavioschwanck I can solve this, I am part of the translation team. thank you for the warning.