Settings Character Limitation Issue

In Settings under the Quiz and Knowledge Title and under the "Quiz Results" label: 

The label currently says "Resultados del cuestionario". I want to change it to "Resulatados del la Prueba".  When I delete the old label and try to enter in the new label, it will only allow a total of 17 characters. The strange thing is the prior label was 27 characters. How do I get the label field to allow more characters?