Updated HTML and additional featuers

I've made a couple of changes to your plugin.

Mainly, I wanted to change the markup so that the arrow and the pre text were _inside_ the anchor and have unique container tags and classes. This allows for greater flexibility in the CSS, for example using image replacement for the arrows. 

I've also added control over where the arrows are rendered relative to the page title. This way, if you wanted a stacked effect (the title and arrow spans are blocks) you can have the arrows below or above. 

I also refactored how you created your tags so its all in one function and consistent. 

I did not translate my additional strings into German because I don't know the language.