[epiphany/mcatanzaro/#1423] Add translator comment for web extension file chooser dialog

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 042a0ad86b45eae3056cbf258349b6c0464f260d
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Wed Jan 20 15:10:17 2021 -0600

    Add translator comment for web extension file chooser dialog
    
    Fixes #1423

 src/ephy-web-extension-dialog.c | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/src/ephy-web-extension-dialog.c b/src/ephy-web-extension-dialog.c
index d1da9f0dc..770e83a92 100644
--- a/src/ephy-web-extension-dialog.c
+++ b/src/ephy-web-extension-dialog.c
@@ -208,6 +208,7 @@ on_add_button_clicked (GtkButton *button,
   GtkFileFilter *filter;
   gint res;
 
+  /* Translators: this is the title of a file chooser dialog. */
   dialog = gtk_file_chooser_dialog_new (_("Open File (manifest.json/xpi)"),
                                         GTK_WINDOW (self),
                                         GTK_FILE_CHOOSER_ACTION_OPEN,