Bug 1580356 - Add back l10n path definition for mobile/android/base. a=bustage-fix

mobile/android/locales/l10n.toml

@@ -128,6 +128,13 @@ exclude-multi-locale = [
     reference = "mobile/android/locales/en-US/**"
     l10n = "{l}mobile/android/**"
 
+[[paths]]
+    reference = "mobile/android/base/locales/en-US/**"
+    l10n = "{l}mobile/android/base/**"
+    test = [
+        "android-dtd",
+    ]
+
 # hand-picked paths from toolkit, keep in sync with jar.mn
 [[paths]]
     reference = "dom/locales/en-US/chrome/global.dtd"