[gimp] Make new Metadata submenu and new dialogs' captions translatable.

[Alexandre Prokoudine <aprokoudine src gnome org>]

commit c68239e937955bb2201a4750605ae850a6260b38
Author: Alexandre Prokoudine <alexandre prokoudine gmail com>
Date:   Sat Jul 8 03:16:41 2017 +0300

    Make new Metadata submenu and new dialogs' captions translatable.
    
    Adjust the tooltip for the Edit Metadata menu item.

 app/actions/image-actions.c         |    1 +
 menus/image-menu.xml.in             |    2 ++
 plug-ins/metadata/metadata-editor.c |    8 ++++----
 plug-ins/metadata/metadata-viewer.c |    2 +-
 4 files changed, 8 insertions(+), 5 deletions(-)
---
diff --git a/app/actions/image-actions.c b/app/actions/image-actions.c
index 27324e7..cdd7446 100644
--- a/app/actions/image-actions.c
+++ b/app/actions/image-actions.c
@@ -62,6 +62,7 @@ static const GimpActionEntry image_actions[] =
                                              "Color Ma_nagement")          },
   { "image-transform-menu",        NULL, NC_("image-action", "_Transform") },
   { "image-guides-menu",           NULL, NC_("image-action", "_Guides")    },
+  { "image-metadata-menu",           NULL, NC_("image-action", "Meta_data")    },
 
   { "colors-menu",              NULL, NC_("image-action", "_Colors")       },
   { "colors-info-menu",         NULL, NC_("image-action", "I_nfo")         },
diff --git a/menus/image-menu.xml.in b/menus/image-menu.xml.in
index 342487a..3d35fae 100644
--- a/menus/image-menu.xml.in
+++ b/menus/image-menu.xml.in
@@ -423,6 +423,8 @@
       </menu>
       <menuitem action="image-configure-grid" />
       <menuitem action="image-properties" />
+      <menu action="image-metadata-menu" name="Metadata">
+      </menu>
       <separator />
     </menu>
 
diff --git a/plug-ins/metadata/metadata-editor.c b/plug-ins/metadata/metadata-editor.c
index dc1e049..92bb6fe 100644
--- a/plug-ins/metadata/metadata-editor.c
+++ b/plug-ins/metadata/metadata-editor.c
@@ -405,15 +405,15 @@ query (void)
   };
 
   gimp_install_procedure (PLUG_IN_PROC,
-                          N_("Edit metadata"),
+                          N_("Edit metadata (IPTC, GPS, DICOM)"),
                           "Edit metadata information attached to the "
-                          "current image.   Some or all of this metadata "
+                          "current image. Some or all of this metadata "
                           "will be saved in the file, depending on the output "
                           "file format.",
                           "Ben Touchette",
                           "Ben Touchette",
                           "2017",
-                          N_("Edit Metadata"),
+                          N_("Edit metadata"),
                           "*",
                           GIMP_PLUGIN,
                           G_N_ELEMENTS (metadata_args), 0,
@@ -536,7 +536,7 @@ metadata_editor_dialog (gint32        image_id,
   g_free (ui_file);
 
   name = gimp_image_get_name (image_id);
-  title = g_strdup_printf ("Metadata Editor: %s", name);
+  title = g_strdup_printf (_("Metadata Editor: %s"), name);
   if (name)
     g_free (name);
 
diff --git a/plug-ins/metadata/metadata-viewer.c b/plug-ins/metadata/metadata-viewer.c
index e6b7cbc..c0be370 100644
--- a/plug-ins/metadata/metadata-viewer.c
+++ b/plug-ins/metadata/metadata-viewer.c
@@ -198,7 +198,7 @@ metadata_viewer_dialog (gint32          image_id,
   g_free (ui_file);
 
   name = gimp_image_get_name (image_id);
-  title = g_strdup_printf ("Metadata Viewer: %s", name);
+  title = g_strdup_printf (_("Metadata Viewer: %s"), name);
   g_free (name);
 
   dialog = gimp_dialog_new (title,