Here is a quick example I did with WinCC V7 SP3.

For the first part of your question: Dynamize text on the screen

Create an internal16 bit Tag called TAG_WORD or change the tag in the PDL to your tag to test this. Click on the Squares 1 to 4 to toggle the corresponding bits in the word. This will then change the text in the Static Text object. It assumes only one bit is on at a time. You will have to add more logic or put your texts in the order of which bit gets checked first if more than one will be on at a time.

Second Part:

I am not too sure what you want to do with the language. If the text you want to show are custom texts I think you will have to define each of them in the specific language and decide with the GetLanguage (); function which set to use when your language has changed.