Load file to a variable and reduce code duplicate
Load file to a variable and reduce code duplicate

By following @jayvdb recommendations, the file to be read is now moved inside a PEP8 compliant variable because the files used are not that huge
Also removed some code duplication in 'coreDictFile' creation
languagetool-org/languagetool-browser-addon,languagetool-org/languagetool-browser-addon,languagetool-org/languagetool-browser-addon,languagetool-org/languagetool-browser-addon