Comment 7 for bug 1252050

According to the install log you posted, the plugin was successfully installed. According to the startup log you posted, calibre started correctly after the installation.

I set my calibre language to French and I was able to see that the plugin installs with the translated name. This is a bug and will be resolved, but it is very low priority since everything functioned properly: the plugin was in the list of installed plugins, the plugin remained installed after many restarts of calibre, conversion options could be set, and books could be converted.