Snagit, the #1 software product used by technical communicators*, has long been the go-to tool for capturing and editing screenshots for user documentation and training guides. In recent years, it's also become popular for making quick screencast videos and animated GIFs to illustrate help content.
The January 2017 release of Snagit (v13.1.x on Windows / v4.1.x on Mac) adds a Translation Workflow capability, to reduce the time and expense of localizing the text that appears in callouts and labels applied to images. See Snagit Translation Workflow video or written guide for details.
* See 2016 Technical Communication Benchmarking Survey, conducted by The Content Wrangler