in IE8, in richtext editor, XML entities get mingled up when editing for the second time

If you use the ' (apostrophe) character in the CMS in the richttext editor, it will be converted into the

'

entity, which does not work in IE8. This causes IE8 users to see this entity and not '.
If they edit & publish the document again, the entity will change into

's

after which all browsers render it incorrectly.

To reproduce:

• build Hippo 7.9 from the archetype and add in essentials the blog feature.
• Open the CMS in IE8
• Change a blogposting to contain ' in the content and publish the blog post
• View the blogpost in IE8, it will not render the ' correctly
• Edit the blogpost in the CMS again using IE8, add some text
• save and publish the blogpost again
• view the blogpost in any browser
• Now the ' character is changed into

  's

  and no browser displays it as ' anymore

TODO:
When richtext field is edited for the second time skip xml codes for &, ", ', < and > such as

'

, etc.