Change wording around local APN configuration preference.

res/values/strings.xml

@@ -372,8 +372,8 @@
     <string name="preferences__slow">Slow</string>
     <string name="preferences__custom">Custom</string>
     <string name="preferences__advanced_mms_access_point_names">Advanced: MMS Access Point Names</string>
-    <string name="preferences__enable_local_apns">Enable local APNs</string>
+    <string name="preferences__enable_fallback_mmsc">Enable Fallback MMSC</string>
-    <string name="preferences__use_apn_information_configured_here_when_system_apn_information_is_unavailable">Use APN information configured here when system APN information is unavailable.</string>
+    <string name="preferences__use_mmsc_information_configured_here_when_system_apn_information_is_unavailable">Use MMSC information configured here when system APN information is unavailable.</string>
     <string name="preferences__mmsc_url_required">MMSC URL (Required)</string>
     <string name="preferences__mms_proxy_host_optional">MMS Proxy Host (Optional)</string>
     <string name="preferences__mms_proxy_port_optional">MMS Proxy Port (Optional)</string>

res/xml/preferences.xml

@@ -144,8 +144,8 @@
   <PreferenceCategory android:title="@string/preferences__advanced_mms_access_point_names">
       <CheckBoxPreference android:key="pref_use_local_apns"
                           android:defaultValue="false"
-                          android:title="@string/preferences__enable_local_apns"
+                          android:title="@string/preferences__enable_fallback_mmsc"
-                          android:summary="@string/preferences__use_apn_information_configured_here_when_system_apn_information_is_unavailable"/>
+                          android:summary="@string/preferences__use_mmsc_information_configured_here_when_system_apn_information_is_unavailable"/>
       
       <EditTextPreference android:key="pref_apn_mmsc_host"
                           android:title="@string/preferences__mmsc_url_required"