I wonder whether locale-selected documentation might be easier using separate (directories of) pod files for each language. The installation process would then need to include a step in ./configure that would identify the appropriate pod set for the current locale, and the resulting "make install" would do "pod2man" using the chosen set of sources. (Likewise, "perldoc" could be adapted so that it is sensitive to locale when looking for pods corresponding to the modules found in @INC.)
This might be preferable to having (an indefinite set of) pod translations concatenated to each source code "*.pm" file in a distribution. Dave G.