.xliff or .po for translating content massively
An xml format that is supported by many professional translation tools
OmegaT is an opensource professional translation tool: 
http://www.omegat.org/en/omegat.html

export source language, and reimport target language, keeping the nodes linked between languages.
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xml import/export »xml import/export
.xliff or .po for translating content massively
Translate Debategraph content »Translate Debategraph content
Translate a complete map (or a view of a map) »Translate a complete map (or a view of a map)
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