Faster translations, smarter re-runs

Translation runs are noticeably faster across the board, and the editor now streams results in with a live loading state, so you get feedback immediately instead of staring at a spinner.

We also taught Localesy to re-translate keys that changed, not just brand-new ones. Edit a source string and its translations refresh automatically, so everything stays in sync as your source evolves. Inline translations in the editor come back faster too.