Export some strings from shared contact details activity

res/layout/activity_shared_contact_details.xml

@@ -103,7 +103,7 @@
                             <TextView
                                 android:layout_width="wrap_content"
                                 android:layout_height="wrap_content"
-                                android:text="Signal Message"
+                                android:text="@string/SharedContactDetailsActivity_signal_message"
                                 android:textColor="@color/signal_primary"/>
 
                         </LinearLayout>
@@ -127,7 +127,7 @@
                             <TextView
                                 android:layout_width="wrap_content"
                                 android:layout_height="wrap_content"
-                                android:text="Signal Call"
+                                android:text="@string/SharedContactDetailsActivity_signal_call"
                                 android:textColor="@color/signal_primary"/>
 
                         </LinearLayout>

res/values/strings.xml

@@ -536,6 +536,8 @@
     <!-- SharedContactDetailsActivity -->
     <string name="SharedContactDetailsActivity_add_to_contacts">Add to Contacts</string>
     <string name="SharedContactDetailsActivity_invite_to_signal">Invite to Signal</string>
+    <string name="SharedContactDetailsActivity_signal_message">Signal Message</string>
+    <string name="SharedContactDetailsActivity_signal_call">Signal Call</string>
 
     <!-- SharedContactView -->
     <string name="SharedContactView_add_to_contacts">Add to Contacts</string>