The CM Download Manager plugin supports localization preferences and currently comes with several language files as described in the plugin WP page (this is updated from time to time so please check the WP site). It is easy to add another localization file to support any additional desired language. Simply take one of the already existing language files from plugins/cm-download-manager/lang and use it to convert to your language. Use POedit to do the actual processing. Once translated, place the two files (PO and MO) inside the lang directory and WP will detect it. More information about localization preferences can be found here.
Please remember that in order for the localization version to work, you will need a WP version installation in same language as your localization file.https://www.cminds.com/wordpress-plugins-knowledge-base-and-documentation/?hscat=8-cm-download-manager