The localizer supports XLIFF XCLOC and Xcstrings files. You can export in any of these formats to edit the localization. Pluralization and all file versions are supported.
The localizer can search by words and check spelling. You can add your words to the library to get spelling for unique words. In the editor, you can immediately see the missing lines and the parameters used inside the text localization.
You can edit several files at the same time - just open them in a new window. The localized file is saved to the current file or you can save as a new file.