refactor UserSelectForCourse

src/components/Dialogs/DialogComponents/UserSelectForCourse.vue

@@ -14,13 +14,24 @@
 
     <label
       class="text-left w-100 d-block text--white available-seats-label"
-      v-if="availableSeatsInCourse === 0 && selectedMembers.length === 0"
+      v-if="
+        isCourseSelected &&
+        availableSeatsInCourse === 0 &&
+        selectedMembers.length === 0
+      "
       >This course is full. You won't be able to add any students.</label
     >
     <label
       class="text-left w-100 d-block text--white available-seats-label"
-      v-else-if="availableSeatsInCourse === 0 && selectedMembers.length > 0"
-      >After you add the selected users this course will be full.</label
+      v-else-if="
+        isCourseSelected &&
+        availableSeatsInCourse === 0 &&
+        selectedMembers.length > 0
+      "
+      >After you add the selected user{{
+        selectedMembers.length > 1 ? "s" : ""
+      }}
+      this course will be full</label
     >
     <label
       class="text-left w-100 d-block text--white available-seats-label"