Adding translation in pt-BR for KeyboardShortcuts.CodeEditing.RenameVariable locale key

[cassiano]

Fixes #3711

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[cassiano]

@raclim, this is exactly the kind ot situation discussed in #3666, where a new feature (or bug fix) in introduced into the editor, bringing along with it new localization keys, which remain untranslated for all locales besides the default en-US until some user notices and manually translates it. My previous suggestion to use AI for this kind of situation, collecting eventual translation suggestions by end users afterwards (in the editor itself), would fully solve this problem.

[cassiano]

BTW, I couldn't find a way to use the "rename variable" shortcut in my Macbook Pro. I have tried all kinds of Fn, Ctrl, Option and Command combinations with F2. Nothing worked.