Move Nimbus strings to static_strings

Goes with 6bb89f346e01edd431056bfcd7472bc3082a39a5

app/src/main/res/values/static_strings.xml

@@ -43,6 +43,8 @@
     <string name="preferences_debug_settings_allow_third_party_root_certs_summary">Allows the use of third party certificates from the Android CA store</string>
     <!-- Label for the Nimbus experiments preference -->
     <string name="preferences_nimbus_experiments">Nimbus Experiments</string>
+    <!-- Label for using the nimbus collections preview -->
+    <string name="preferences_nimbus_use_preview_collection">Use Nimbus Preview Collection (requires restart)</string>
 
     <!-- Label for showing Synced Tabs in the tabs tray -->
     <string name="preferences_debug_synced_tabs_tabs_tray">Show Synced Tabs in the tabs tray</string>

app/src/main/res/values/strings.xml

@@ -1764,6 +1764,5 @@
 
     <!-- Content description for privacy content close button -->
     <string name="privacy_content_close_button_content_description">Close</string>
-    <string name="mozac_service_nimbus_use_preview_collection">Use Nimbus Preview Collection (requires restart)</string>
 
 </resources>

app/src/main/res/xml/secret_settings_preferences.xml

@@ -18,6 +18,6 @@
     <SwitchPreference
         android:defaultValue="false"
         android:key="@string/pref_key_nimbus_use_preview"
-        android:title="@string/mozac_service_nimbus_use_preview_collection"
+        android:title="@string/preferences_nimbus_use_preview_collection"
         app:iconSpaceReserved="false" />
 </PreferenceScreen>