Current latest version of Book Rich Snippet Addon addon requires GD Rating System Pro version 4.2 or newer.

Book Rich Snippet Addon addon requires one of the following PHP versions: 5.6, 7.0, 7.1, 7.2, 7.3, 7.4. The plugin might work with older PHP versions, but they are no longer tested or supported.

Book Rich Snippet Addon addon requires one of the following WordPress versions: 4.9, 5.0, 5.1, 5.2, 5.3, 5.4, 5.5, 5.6. The plugin might work with older WordPress versions, but they are no longer tested or supported.

Book Rich Snippet Addon addon requires one of the following ClassicPress versions: 1.0, 1.1, 1.2.

Book Rich Snippet Addon addon is 1 year, 4 months old.

Book Rich Snippet Addon addon was first released on January 22, 2020.

Book Rich Snippet Addon addon latest version 2.2 was released on June 1, 2020.

The detailed changelog for Book Rich Snippet Addon addon is available here: Book Rich Snippet Addon Changelog.

Yes. POT file is provided as a base for translation in the root folder for each plugin. Translation files should go into languages directory, and WordPress must be set to your language to load the file. The file name for translated and compiled MO file must be the same as POT file with the addition of language code: {addon-name}-{language-code}.mo.

You can check out this for translating plugins using POEdit program:
wp.dev4press.com/tutorials/translating-plugins-or-themes-using-poedit