[geary/wip/piotrdrag/fix-contract-description] Add a comment about why we're calling msgfmt manually

[Michael Gratton <mjog src gnome org>]

commit d3cbeda0c6f3da6976eee0535f25c711bbc49358
Author: Michael Gratton <mike vee net>
Date:   Tue Oct 9 09:59:48 2018 +0000

    Add a comment about why we're calling msgfmt manually

 desktop/meson.build | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/desktop/meson.build b/desktop/meson.build
index 56e39d2f..e051cdc9 100644
--- a/desktop/meson.build
+++ b/desktop/meson.build
@@ -21,7 +21,8 @@ i18n.merge_file(
 
 # Contractor file (Elementary OS)
 if install_contractor_file
-
+  # Call msgfmt manually since gettext won't otherwise translate the
+  # Description field. See merge req !50.
   msgfmt = find_program('msgfmt')
 
   custom_target(