Support for more languages by using babel

[GoogleCodeExporter]

I have made a branch where I implemented support for using the external library 
babel to translate months and weekday names. This gives support for many 
locales (something like 650) in one go.
Would you be interested in merging it? 
If so I will do a clean-up to solve some problems that the patch currently have:
* pdfs in Arabic, Chinese and some other languages have missing characters 
(most likely a font problem).
* the week_of_year_prefix is currently missing (should be possible to extract 
from the date formatting functions).

Link to the code: https://code.google.com/r/jens-babel/source/browse/
Link to babel: http://babel.pocoo.org/

Original issue reported on code.google.com by j...@persson.cx on 12 Jan 2015 at 7:39

[GoogleCodeExporter]

A few notes on backward comparability

* I reused the -l as short option, but the language name changed to lower-case 
(ie. '-l de' instead of '-l DE')
* meanwhile --lang is changed to --locale
* --list-langs changed to --list-locales (and is very long)
* The --lang-var option is removed

Original comment by j...@persson.cx on 13 Jan 2015 at 6:48

[GoogleCodeExporter]

Very cool idea (and maybe more pythonic). Haven't used python babel before but 
looks promising. Go ahead and clean it up, I will merge it. Don't care about 
backward compatibility, callirhoe adoption is still low, we don't mind if sth 
breaks :)

Regarding Arabic and some other right-to-left languages... do you think it will 
be as simple as rendering a (reverse) unicode string with the existing (cairo) 
left-to-right routines? (and possibly applying right-alignment)

Original comment by geortz on 13 Jan 2015 at 7:50