Beside default jobs, Translation Management Tool (tmgmt) additionally provides Continuous Jobs for supported translators.
Continuous jobs allow to automatically and continuously submit all new and updated content to the configured translator. Each job has a specific language pair while multiple jobs can be created to translate into and from different languages.
Why doesn't the "Request translation" button show at node/%/translate for some of my content?
This is likely an issue with the configuration of the main content block. Visit Structure > Blocks > and click on configure for "Main page content". Make sure the visibility settings are correct for your site, especially Pages and Content types.
Why I see EntityMetadataWrapperException about missing data property plugin at admin/config/regional/tmgmt/translators page?