Translate strings in RecipientPreferenceActivity

Fixes #3405
Closes #3409

 // FREEBIE

res/values/strings.xml

@@ -307,6 +307,8 @@
     <string name="RecipientPreferenceActivity_unblock_this_contact_question">Unblock this contact?</string>
     <string name="RecipientPreferenceActivity_are_you_sure_you_want_to_unblock_this_contact">Are you sure you want to unblock this contact?</string>
     <string name="RecipientPreferenceActivity_unblock">Unblock</string>
+    <string name="RecipientPreferenceActivity_enabled">Enabled</string>
+    <string name="RecipientPreferenceActivity_disabled">Disabled</string>
 
     <!-- RegistrationActivity -->
     <string name="RegistrationActivity_connect_with_textsecure">Connect With TextSecure</string>

src/org/thoughtcrime/securesms/RecipientPreferenceActivity.java

@@ -186,10 +186,10 @@ public class RecipientPreferenceActivity extends PassphraseRequiredActionBarActi
         vibratePreference.setSummary(R.string.preferences__default);
         vibratePreference.setValueIndex(0);
       } else if (recipients.getVibrate() == VibrateState.ENABLED) {
-        vibratePreference.setSummary("Enabled");
+        vibratePreference.setSummary(R.string.RecipientPreferenceActivity_enabled);
         vibratePreference.setValueIndex(1);
       } else {
-        vibratePreference.setSummary("Disabled");
+        vibratePreference.setSummary(R.string.RecipientPreferenceActivity_disabled);
         vibratePreference.setValueIndex(2);
       }
 
@@ -197,8 +197,8 @@ public class RecipientPreferenceActivity extends PassphraseRequiredActionBarActi
         blockPreference.setEnabled(false);
       } else {
         blockPreference.setEnabled(true);
-        if (recipients.isBlocked()) blockPreference.setTitle("Unblock");
-        else                        blockPreference.setTitle("Block");
+        if (recipients.isBlocked()) blockPreference.setTitle(R.string.RecipientPreferenceActivity_unblock);
+        else                        blockPreference.setTitle(R.string.RecipientPreferenceActivity_block);
       }
     }