Do not attempt to translate learningResourceType

This is no longer an enum, so we cannot reliably
translate it.

src/main/webapp/app/exercise/exercise-details/exercise-metadata/exercise-metadata.component.html

@@ -96,9 +96,8 @@
     </jhi-exercise-metadata-item>
 
     <jhi-exercise-metadata-item
-        *ngIf="exercise.learningResourceType"
         [description]="'exercise.metadata.learningResourceType'"
-        [value]="'exercise.metadata.' + exercise.learningResourceType | translate">
+        [value]="exercise.learningResourceType">
     </jhi-exercise-metadata-item>
 
     <jhi-exercise-metadata-item