Polish: uppercase all admin view button text

- AuditLogView.php: FILTER, RESET
- UserActivityView.php: APPLY, RESET
- ApiKeysView.php: GENERATE KEY, COPY, REVOKE
- WorkflowDesignerView.php: + NEW TRANSITION, EDIT, DELETE, SAVE, CANCEL
- CustomFieldsView.php: + NEW FIELD, EDIT, DELETE, SAVE, CANCEL
- TemplatesView.php: + NEW TEMPLATE, EDIT, DELETE, SAVE, CANCEL
- RecurringTicketsView.php: + NEW RECURRING TICKET, EDIT, DISABLE/ENABLE, DELETE, SAVE, CANCEL

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

views/admin/UserActivityView.php

@@ -51,7 +51,7 @@ $nonce = SecurityHeadersMiddleware::getNonce();
                         <label style="display: block; font-size: 0.8rem; color: var(--terminal-amber);">Date To</label>
                         <input type="date" name="date_to" value="<?php echo htmlspecialchars($dateRange['to'] ?? ''); ?>" class="setting-select">
                     </div>
-                    <button type="submit" class="btn">Apply</button>
+                    <button type="submit" class="btn">APPLY</button>
                     <a href="?" class="btn btn-secondary">Reset</a>
                 </form>