config: 15.1: Add Exchange

* This is an AOSP app but no longer updated, add it so we
  can translate to the new available languages

Change-Id: I4ce196c9948fcc723c151a4b8c291c8094a0690a
diff --git a/config/lineage-15.1.yaml b/config/lineage-15.1.yaml
index 29dcf40..386a25b 100644
--- a/config/lineage-15.1.yaml
+++ b/config/lineage-15.1.yaml
@@ -333,6 +333,12 @@
     translation: '/%original_path%-%android_code%/%original_file_name%'
     languages_mapping: *anchor
 
+  # Exchange
+  -
+    source:      '/packages/apps/Exchange/res/values/strings.xml'
+    translation: '/%original_path%-%android_code%/%original_file_name%'
+    languages_mapping: *anchor
+
   # FMRadio
   -
     source:      '/packages/apps/FMRadio/res/values/cm_strings.xml'