Back in a while, Google Keyboard was able to save words to its own dictionary by writing the word and showing Touch again to save.
I just realized that the option is still there, you just don't get the "touch to save" dialog. Type the word, select it and press on it like you're used to. Hope this helps :-)
Well, when I write a word, and touch it, nothing happens. If I try to use that word again, it is not suggested (the device is a Nexus 5X).
The language of the keyboard is not English.
How could I make Google Keyboard to save the words (without adding it to the Personal Dictionary in the menu)?