Added localization

Added localization for EsoheadConstants.lua to EH.validNodes.  German is release quality needing only "Kresh Weed", "Pure Water", "Heavy Sack", "Silver Weed", and "Jute" translations.  French is not release quality but maybe if it were released and partially working a French speaking volunteer could offer additional translation.

I posted for help.  I'll commit any changes I get from the forums.