OpenSEF seems to be the community preferred component for implementing search engine friendly links in Joomla! sites but unfortunately it's not compatible with Joom!Fish. Which means if you're using Joom!Fish to handle your mulit-language site you'll have to find an alternative.
One option is to wait for OpenSEF 2.0.0 RC6 which is due out sometime soon or switch to using Artio JoomSEF (@Joomla Extensions). The current version of JoomSEF offers all the features of OpenSEF and is compatible with Joom!Fish.
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