Use Unicode-aware CreateProcessW on Win32 to spawn applications.

subprocess' Popen method does not call CreateProcessW internally, but
CreateProcessA. This mangles all Unicode filenames and likely leads to
problems when one of the arguments contains non-ASCII portions.

Work around by rolling a custom Popen function. Sigh.

git-svn-id: svn+ssh://svn.code.sf.net/p/mcomix/code@848 ef8490bc-f317-4725-81ed-e95a9aca1bcf
Rebind command 0 to 8 to keys 1 to 9. F8 still executes the first command.

git-svn-id: svn+ssh://svn.code.sf.net/p/mcomix/code@849 ef8490bc-f317-4725-81ed-e95a9aca1bcf
Update translation template.

git-svn-id: svn+ssh://svn.code.sf.net/p/mcomix/code@850 ef8490bc-f317-4725-81ed-e95a9aca1bcf