Fix make_locale to be more pythonic

[agilewalker]

I'm trying to build android app on Windows , but errors with make_locale becomes a show stopper.
Between line 24 and line 31 make_locale create a shell to execute a 'find' command to search all the files that needs to be translated. Although there is indeed a 'find' command on Windows, but it's totally different from the unix-like one.
This PR fix the problem by rewriting the relevant parts with pure os-agnostic python code.

[agilewalker]

Note to Android developer building on Windows: make_locale requires xgettext for windows to build.

[cculianu]

Oh wow this is really cool. Thanks for this fix. Let me test it now and merge if I see no issues.

[cculianu]

This is great. I just tested it. It seems the translations end up in a different order in the comments only (which is not surprising) than with the stupid find method.. but that's ok. It finds everything, which is what we care about. Thanks for this! Merging.

[EchterAgo]

This is great. I just tested it. It seems the translations end up in a different order in the comments only (which is not surprising) than with the stupid find method.. but that's ok. It finds everything, which is what we care about. Thanks for this! Merging.

There is one other change in behaviour, find does not follow symlinks, this does. Should not be a problem for most people, but I'll have to be a bit more careful with my setup.

[cculianu]

Oh that's good to know! Thanks for pointing that out @EchterAgo 👍