[gimp] app: adding a comment for translators.

[Jehan <jehanp src gnome org>]

commit f8f768c077c1dbf8bdf0857d3a611c7df2aa3620
Author: Jehan <jehan girinstud io>
Date:   Thu Jul 22 17:01:03 2021 +0200

    app: adding a comment for translators.
    
    As per comment by Alexandre Franke, so that translators are aware this
    is not about a "map" like a "world map", but like "mapping" filters.
    
    Cf. https://gitlab.gnome.org/Teams/Translation/fr/-/issues/17#note_1209282

 app/actions/filters-actions.c | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/app/actions/filters-actions.c b/app/actions/filters-actions.c
index f98085987d..6ac51f4375 100644
--- a/app/actions/filters-actions.c
+++ b/app/actions/filters-actions.c
@@ -80,6 +80,10 @@ static const GimpActionEntry filters_menu_actions[] =
   { "filters-decor-menu",           NULL, NC_("filters-action",
                                               "_Decor")            },
   { "filters-map-menu",             NULL, NC_("filters-action",
+                                              /* TRANSLATORS: menu group
+                                               * containing mapping
+                                               * filters.
+                                               */
                                               "_Map")              },
   { "filters-render-menu",          NULL, NC_("filters-action",
                                               "_Render")           },