Pressing Enter Refreshes the Add Category Form Page

**Preconditions:**
The user must be logged in on the "Categorii activitati" page.

**Steps to Reproduce:**
1. Click on the "Adauga Categorie" button
2. Click on the "Denumire tip activitate" input
3. Press the Enter key

**Expected Results:**
3. No action is taken.

**Actual Results:**
3. The page is refreshed.

**Note:**
The bug can be reproduced by clicking on any inputs except "Alege imagine" pictures.