caja-dropbox 1.25.0 release

Changes since the last release: v1.24.0...v1.25.0

caja-dropbox 1.25.0

update translations
update copyright for 2021
dropbox-client-util: add missing include
caja-dropbox: reset_all_files is a static function
caja-dropbox.pot: use UTF-8 charset
Add i18n support
Remove USE_MATE2_MACROS from autogen.sh (legacy)
build: silent build warnings for distcheck
build: Silent building
use MATE_COMPILE_WARNINGS from mate-common