Fix translations

exam/react/src/components/Forms/Login/Login.tsx

@@ -58,7 +58,7 @@ const Login: FC = () => {
                   onBlur={field.handleBlur}
                   onChange={(e) => field.handleChange(e.target.value)}
                   size="small"
-                  label={t('E-Mail')}
+                  label={t('EMail')}
                   required
                   error={field.state.meta.isTouched && field.state.meta.errors.length > 0}
                   helperText={field.state.meta.isTouched ? field.state.meta.errors.join(',') : ''}
@@ -106,7 +106,7 @@ const Login: FC = () => {
             </>
           )}
         />
-        <Typography color="error.main">{t(...handleError(error, 'login'))}</Typography>
+        {error && <Typography color="error.main">{t(...handleError(error, 'login'))}</Typography>}
       </Box>
     </form>
   );