[TYPO3-core] Different title tag when using "subtitle" field

[Kamil R]

Hi Christian,
many thanks for your tip about the extension. It's really close to what I'm trying to make. Also thanks you for your piece of code. It's working but... I'm very very green with TYPO and this is my first fight. 

Your code is append custom text to subtitle and the line that supposed add text to "title" is not working (it display only title field, without any "title_sufix"). Can I ask you for another try with this? Many many thanks for your (and Jo, from previous posts) help with my issue.