Minor fixes for hiring administration (#575)

* Simplify button language

* Fix API for creating missing course sites for a term

backend/services/academics/hiring.py

@@ -154,6 +154,7 @@ def create_missing_course_sites_for_term(self, subject: User, term_id: str) -> b
 
         # Get a list of all sections that are not associated with course sites
         section_query = select(SectionEntity).where(
+            SectionEntity.term_id == term_id,
             SectionEntity.course_site_id.is_(None)
         )
         joint: dict[tuple[str, str], list[SectionEntity]] = {}

frontend/src/app/hiring/hiring-admin/hiring-admin.component.html

@@ -4,12 +4,12 @@
     <mat-card-title>{{ selectedTerm().name }} Hiring</mat-card-title>
     <div class="header-actions">
       <button mat-stroked-button (click)="updateEnrollmentTotals()">
-        Update Enrollment Totals
+        Enrollments
       </button>
       <button mat-stroked-button routerLink="/hiring/levels">
-        Manage Hiring Levels
+        Levels
       </button>
-      <button mat-flat-button routerLink="/hiring/summary">View Summary</button>
+      <button mat-flat-button routerLink="/hiring/summary">Onboarding</button>
       <mat-form-field class="term-selector" appearance="outline">
         <mat-label>Select Term</mat-label>
         <mat-select