I answered my Q1 in msg187219: test.test_gettest is currently passing, with no skips, on 2.7 and 3.4 on Win 7.

patch.diff: I would rather add the 4 lines of the proposed idle_i18n.py to an existing module, perhaps Bindings.py itself, since that is the first place _ will be used.  I think +-60 modules is already too many.

The binding of '_' to gettext.gettext conflicts with the somewhat common use of '_' as a dummy identifier.  I do not know of any such uses in idlelib, but there might be.  There are about 4500 lines in idlelib with '_'; too many to review.  Someone should do a more refined search with an re that excludes '_' preceded or followed by an identifier char, to skip '__xyz__' or '_x' or 'y_'.

If '_ is used for gettest, a new rule to not otherwise bind '_' should be added the currently non-existent Idle maintainer guide.

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