[gthumb] extensions list: show a tooltip for the preferences button

[Paolo Bacchilega <paobac src gnome org>]

commit ed0217268e24b174652d843abe40d323f6dea787
Author: Paolo Bacchilega <paobac src gnome org>
Date:   Sun Oct 26 18:57:26 2014 +0100

    extensions list: show a tooltip for the preferences button

 gthumb/dlg-preferences-extensions.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/gthumb/dlg-preferences-extensions.c b/gthumb/dlg-preferences-extensions.c
index 05b4b98..d07008f 100644
--- a/gthumb/dlg-preferences-extensions.c
+++ b/gthumb/dlg-preferences-extensions.c
@@ -552,6 +552,7 @@ create_extensions_row (GthExtensionDescription      *description,
        extension = gth_extension_description_get_extension (description);
        if ((extension != NULL) && gth_extension_is_configurable (extension)) {
                button = gtk_button_new_from_icon_name ("emblem-system-symbolic", GTK_ICON_SIZE_BUTTON);
+               gtk_widget_set_tooltip_text (button, _("Preferences"));
                gtk_widget_set_valign (button, GTK_ALIGN_CENTER);
                g_signal_connect (button,
                                  "clicked",