[gimp] plug-ins: do not use stock IDs.

[Jehan Pagès <jehanp src gnome org>]

commit ad4564e527b9a5092a504cb13cab30794982aa79
Author: Jehan <jehan girinstud io>
Date:   Wed Aug 23 21:43:58 2017 +0200

    plug-ins: do not use stock IDs.
    
    They are to be deprecated in future GTK+ and we don't use them anymore
    anywhere else in our code.
    See also commit 7da7bab0.

 plug-ins/metadata/metadata-editor.c |   16 ++++++----------
 1 files changed, 6 insertions(+), 10 deletions(-)
---
diff --git a/plug-ins/metadata/metadata-editor.c b/plug-ins/metadata/metadata-editor.c
index d2d6c63..3629a63 100644
--- a/plug-ins/metadata/metadata-editor.c
+++ b/plug-ins/metadata/metadata-editor.c
@@ -544,7 +544,7 @@ metadata_editor_dialog (gint32        image_id,
                             "gimp-metadata-editor-dialog",
                             NULL, 0,
                             gimp_standard_help_func, PLUG_IN_PROC,
-                            GTK_STOCK_CANCEL, GTK_RESPONSE_NO,
+                            _("_Cancel"),        GTK_RESPONSE_NO,
                             _("Write Metadata"), GTK_RESPONSE_YES,
                             NULL);
 
@@ -761,7 +761,7 @@ on_date_button_clicked (GtkButton *widget,
     gtk_dialog_new_with_buttons (_("Calendar Date:"),
                                  NULL,
                                  GTK_DIALOG_MODAL | GTK_DIALOG_DESTROY_WITH_PARENT,
-                                 GTK_STOCK_CANCEL, GTK_RESPONSE_NO,
+                                 _("_Cancel"),  GTK_RESPONSE_NO,
                                  _("Set Date"), GTK_RESPONSE_YES,
                                  NULL);
 
@@ -5615,10 +5615,8 @@ import_dialog_metadata (metadata_editor *args)
   file_dialog = gtk_file_chooser_dialog_new ("Import Metadata File",
                                              NULL,
                                              GTK_FILE_CHOOSER_ACTION_OPEN,
-                                             GTK_STOCK_CANCEL,
-                                             GTK_RESPONSE_CANCEL,
-                                             GTK_STOCK_OPEN,
-                                             GTK_RESPONSE_ACCEPT,
+                                             _("_Cancel"), GTK_RESPONSE_CANCEL,
+                                             _("_Import"), GTK_RESPONSE_ACCEPT,
                                              NULL);
 
   gtk_file_chooser_set_filename (GTK_FILE_CHOOSER (file_dialog),
@@ -5652,10 +5650,8 @@ export_dialog_metadata (metadata_editor *args)
   file_dialog = gtk_file_chooser_dialog_new ("Export Metadata File",
                                              NULL,
                                              GTK_FILE_CHOOSER_ACTION_SAVE,
-                                             GTK_STOCK_CANCEL,
-                                             GTK_RESPONSE_CANCEL,
-                                             GTK_STOCK_SAVE,
-                                             GTK_RESPONSE_ACCEPT,
+                                             _("_Cancel"), GTK_RESPONSE_CANCEL,
+                                             _("_Export"), GTK_RESPONSE_ACCEPT,
                                              NULL);
 
   gtk_file_chooser_set_do_overwrite_confirmation (GTK_FILE_CHOOSER (file_dialog),