Add Portuguese Brazil translations of Commits Page

Supplement pt_BR translation of Commits Page

/cc @marcia @fabiobeneditto @leandronunes @alexandre.alencar

Progression

• Template (.pot file)
• Translation (.po file)
• Packaging (app.js file)

Links / references

• #32951 (closed) : Community translations (Meta)
• v9.4-CommitsPage is Translation branch on the Zanata project