VPL_COMPILATIONFAILED insufficiently escaped in default_vpl.sh
Content of VPL_COMPILATIONFAILED variable isn't properly escaped in default_evaluate.sh. As the "compilation failed" message in french contains a single quote, this leads to a syntax error in vpl_execution, when evaluating a student file which doesn't compile :
in English : ![image](data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==)
in French : ![image](data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==)