Try to reach Apertium-apy in http://localhost:2737/ rather than the (…

[rmh2022]

This makes Apertium module target an install of Apertium in the same computer where translate-shell is running (by default it listens in http://localhost:2737).

A working setup can be easily obtained by installing a pre-packaged version of Apertium (e.g. Debian or Fedora). No further configuration is necessary.

This fixes issue #378.