Pontoon/Firefox for Android: Update Lao (lo)

Co-authored-by: Saleumsack KEOBOUALAY <saleumsack16@gmail.com> (lo)

mozilla-mobile/fenix/app/src/main/res/values-lo/strings.xml

@@ -411,6 +411,12 @@
     <!-- Onboarding toolbar selection card label for 'top' option, used by Nimbus experiments. -->
     <string name="onboarding_customize_toolbar_top_option">ເທິງ</string>
 
+    <!-- Onboarding toolbar selection card label for 'Not now' button, used by Nimbus experiments. -->
+    <string name="onboarding_customize_toolbar_not_now_button" moz:removedIn="136" tools:ignore="UnusedResources">ບໍ່ແມ່ນຕອນນີ້</string>
+
+    <!-- Onboarding header for the theme selection card, used by Nimbus experiments. -->
+    <string name="onboarding_customize_theme_title" tools:ignore="UnusedResources">ເລືອກຮູບແບບສີສັນ</string>
+
     <!-- Search Widget -->
     <!-- Content description for searching with a widget. The first parameter is the name of the application.-->
     <string name="search_widget_content_description_2">ເປີດແຖບ %1$s ໃໝ່</string>