Copy set_locale route from solidus_i18n
Copy set_locale route from solidus_i18n

Our existing route to locale#set was a GET (which it shouldn't be), this
adds it again as a POST. The existing get route is left for
compatibility.

The route is named "select_locale" instead of "set_locale" to avoid a
conflict with the existing solidus_i18n route.

pervino/solidus,pervino/solidus,pervino/solidus,pervino/solidus