Added strings for selecting category inside import file. MDL-4163

lang/en_utf8/quiz.php

@@ -206,6 +206,7 @@ $string['formatnotfound'] = 'Import/export format $a not found';
 $string['formatnotimplemented'] = 'This format has not been correctly implemented, please post a bug report';
 $string['fractionsaddwrong'] = 'The positive grades you have chosen do not add up to 100%%<br />Instead, they add up to $a%%<br />Do you want to go back and fix this question?';
 $string['fractionsnomax'] = 'One of the answers should be 100%%, so that it is<br />possible to get a full grade for this question.<br />Do you want to go back and fix this question?';
+$string['fromfile'] = 'from file:';
 $string['functiontakesatleasttwo'] = 'The function $a must have at least two arguments';
 $string['functiontakesnoargs'] = 'The function $a does not take any arguments';
 $string['functiontakesonearg'] = 'The function $a must have exactly one argument';
@@ -233,6 +234,7 @@ $string['illegalformulasyntax'] = 'Illegal formula syntax starting with \'$a\'';
 $string['imagedisplay'] = 'Image to display';
 $string['imagemissing'] = 'Image not available at line $a. The filename will be ignored';
 $string['import'] = 'Import';
+$string['importcategory'] = 'import category';
 $string['importerror'] = 'An error occurred during import processing';
 $string['importfilearea'] = 'Import from file already in course files...';
 $string['importfileupload'] = 'Import from file upload...';