Allow multi-word search.
example "wik -enfr look for" will work fine.

fix a bug with undefinded preferencies

In order to invert the default languages, use just a minus sign before the word. Example:
"wr shoes" will translate shoes as specified in the extensions parameters (eg. from Rnglish to French)
"wr - shoes" will invert the translation languages (e.g. from French to English)