Add missing settings strings.

Also re-enable and fix tests.

Test: manual
Fixes: 226183482
Fixes: 218799125
Fixes: 219375624

Change-Id: I9605f1f4e2e834baf63e015e96639567c5481b5f

tests/robotests/src/com/android/settings/language/UserDictionaryPreferenceControllerTest.java

@@ -18,6 +18,10 @@ package com.android.settings.language;
 
 import static com.google.common.truth.Truth.assertThat;
 
+import static org.mockito.Mockito.doReturn;
+import static org.mockito.Mockito.mock;
+
+import android.app.admin.DevicePolicyManager;
 import android.content.Context;
 
 import androidx.preference.Preference;
@@ -48,6 +52,8 @@ public class UserDictionaryPreferenceControllerTest {
     @Before
     public void setUp() {
         MockitoAnnotations.initMocks(this);
+        doReturn(mock(DevicePolicyManager.class)).when(mContext)
+                .getSystemService(Context.DEVICE_POLICY_SERVICE);
         FakeFeatureFactory.setupForTest();
         mController = new TestController(mContext);
         mPreference = new Preference(RuntimeEnvironment.application);