Html problem

Check the FAQ for how to install different language versions of date.js

https://wordpress.org/plugins/google-calendar-widget/faq/

I have not built in support for automatically choosing the right one based on your language so you have to copy the correct language version of the file and replace the date.js in the plugin folder.

That is also covered in the FAQ. The plugin uses wiky.js to format the text in the calendar entry. The idea behind this was to make the markup easy to write and easier to read without formatting.

You can disable this by editing the plugin.

In ko-calendar.js, replace this

bodyDiv.innerHTML = Wiky.toHtml(entryDesc);

With this

bodyDiv.innerHTML = entryDesc;

I should make this an option in the future.