CPMT: Fix the exporter so it produces clean acbf files.
The output files are verified against the acbf-1.1.xsd
Only two errors remain:
- Keyword element cannot appear multiple times according to the xsd, but this should be possible according to the spec, once for each translation.
- References cannot have language tags in 1.1, but they can in 1.2. I'll leave this for now.
Other than that this replaces the spaces with underlines because spaces are annoying
in the command line.