Allow usage of env variables in localization .json files

[Benjiiim]

Teams Toolkit is allowing us to use env variables in the Teams/Microsoft 365 manifest file.
However, this doesn't seem to work in localization .json files used to localize a Teams app.
That would be useful, for example for the ${{APP_NAME_SUFFIX}} in the name.short property and its translations.

[microsoft-github-policy-service]

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[MuyangAmigo]

Hey, thanks for raising this! We are adding thiss request to our feature backlog.