Click in a button with a changing text and keyboard language

Hello

2 questions.

I have to click in this button
[CLASS:Button; NAME:MERGE 2 FILES]

But the number of files changes each time. Then in can be that this time is marge 2 files and next 4 files, any way that robot look a button with name: Marge “any type of number” files?

Second question.
I done the script in a computer with the keyboard in Spanish. Now I have it in a computer with Keyboard in English. The issue is that robot wright the text as spanish with a keyboard English.
Then when in the scrip shows text c:. Robot enter the text c/. Where I can set up that?

Thanks

Hello,

can someone help me? Thanks