There are copy/paste buttons on Gboard, but they're kind of hidden. Press the 4 squares in the top left of the keyboard and select Text Editing. You get arrow keys, a button for toggling select, and cut/copy/paste. In a way it's like switching out of insert mode in vim.
The language is Dutch, the collection of dialects spoken in the Flanders region is Flemish. If you're feeling charitable, you can refer to it as a language variant.
Here is the constitution of Belgium: https://www.senate.be/doc/const_nl.html
Articles 2 and 3 define the Flemish (Vlaamse) community and region. Article 4 defines the language areas and specifically mentions Dutch (Nederlands), not Flemish.