Log Message:
Update caja-extensions to 1.20.0:

xattr-tags: use better English in extension description
po: add missing translatable strings from xattrs extension
xattr-tags: fix extension description
open-terminal: don’t use excessive string duplication
avoid deprecated gdk_screen_make_display_name
sendto burn: avoid deprecated gtk_show_uri
xattr-tags: remove hack, it’s not needed now
xattr-tags: fix typo causing undefined reference
fix the libcaja_gksu_la_LDFLAGS variable declaration
xattr-tags: add missing newline to startup message
xattr-tags: unescaping stored attributes.
Translations update