Fix feature model edit

src/app/canvas/feature-model/feature-model-edit/feature-model-edit.component.html

@@ -42,7 +42,7 @@
 </ng-template>
 
 <div class="my-3 alert alert-info container" role="alert">
-  <p>View and edit the feature model tree. You can:</p>
+  <p>View and edit the feature tree. You can:</p>
   <ul>
     <li>
       at the bottom of the page
@@ -68,7 +68,7 @@
 
 <!-- List of Features -->
 <div class="my-3 p-3 bg-white rounded shadow-sm">
-  <h6 class="border-bottom border-gray pb-2 mb-0">Model List</h6>
+  <h6 class="border-bottom border-gray pb-2 mb-0">Feature tree</h6>
 
   <div class="row">
     <div class="col-sm-12">
@@ -142,6 +142,7 @@
       </button>
     </div>
     <div class="mt-4" *ngIf="problems">
+      <!-- TODO: maybe rename -->
       <h6>Instantiation problems:</h6>
       <p *ngIf="problems.length === 0">No problems detected.</p>
       <ul *ngIf="problems.length > 0">