Single quote error in tags

[devil1591]

Tested on svn 6250.
If you put a single quote in a tag, it will display a backslash before the quote.

ex : "maladie d'amour" will display "maladie d\'amour"

[Viper007Bond]

Needs more stripslashes().

[ryan]

I can't reproduce this on the 2.3 branch, only on trunk.

I noticed that 2.4 wasn't selectable as a version in trac. I added it so that we can mark these 2.4 specific bug appropriately.

[ryan]

I think wp_insert_term() needs to strip before calling insert().

[markjaquith]

(In [6267]) Stripslashes tag names to prevent double slashing in wp_insert_term(). fixes #5202