Fix the fish translations of the environment syntax.
The environment we got back from the 'local::lib' tool is being translated into 'fish' commands so that the environment is set up properly for the fish sell. However, it was broken. The expressions that were given had incorrect escaping, so they ended up not working properly, and the regular user environment was used instead. The sed translations should now be fixed. Needs checking on OSX, but it certainly works on Linux.
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