You can find more information on both the Spanish and Portuguese translations here: http://pkp.sfu.ca/ocs-languages
. Each locale has its own page, with contributor contact information. Also, if you are using OCS 2.1+, you can use the packaged Translator plugin to complete translations -- it will check locale files for you, and present you with anything that still needs to be filled out. More information is available at http://pkp.sfu.ca/files/docs/translating
If you do complete either translation to your satisfaction, please consider contributing these back to the project -- this important contribution would be very much appreciated.