Brazilian Portuguese (pt_BR) translation improvement

[pxfm]

Current behavior

There are some pt_BR sentences that can be improved and it will make more sense in the language general context.

Expected behavior

Better experience to Brazilian customers / community.

Steps to reproduce the issue

Repository

Can you handle fixing this bug by yourself?

• YES
• NO

Which Release Cycle state this refers to? Info for developer.

Pick one option.

• This is a bug report for test version on https://test.storefrontcloud.io - In this case Developer should create branch from develop branch and create Pull Request 2. Feature / Improvement back to develop.
• This is a bug report for current Release Candidate version on https://next.storefrontcloud.io - In this case Developer should create branch from release branch and create Pull Request 3. Stabilisation fix back to release.
• This is a bug report for current Stable version on https://demo.storefrontcloud.io and should be placed in next stable version hotfix - In this case Developer should create branch from hotfix or master branch and create Pull Request 4. Hotfix back to hotfix.

Environment details

• Browser: Google Chrome Version 75.0.3770.142 (Official Build) (64-bit)
• OS: MacOS Mojave 10.14.5
• Node: v10.16.0
• Code Version: develop

Additional information