Ideas for Google Summer of Code/Adopt a language pair
This project will involve writing linguistic data, including morphological rules and transfer rules — which are specified in a declarative language. A good intro would be to look through Apertium New Language Pair HOWTO, see also Contributing to an existing pair. If the pair has OK dictionaries but a bad tagger (disambiguator), a GsoC project might involve writing a good Constraint Grammar for the pair (although this would likely require more knowledge of and interest in linguistics).
The coding challenge for this task is to ...
Previous GSOC projects
And pairs which were adopted in past years: