Updated run.py for bower package mngmnt and babel

Suggestion for `run.py` to be applied when recent changes in `gae-init` are applied to `gae-init-babel`, in particular based on changes made in https://github.com/gae-init/gae-init/pull/95 *"Using bower package management for vendor libraries"*.

I've applied a `pybabel_` prefix to all translations oriented handling; and added the `pybabel_compile()` step to the `ARGS.minify` handling to ensure this is done before uploading. Previously, in 12.0 based `gae-init-babel`, the `minify` step also initialized, extracted, updated, and compiled translations; which might be a little too much automation; given that there could be many `fuzzy` and `""` (blank) translations.