Update the project creation and add customization help pages

I have tried to structure instructions like this in the form "To do THING, perform ACTIONS". I forget whether I read that in a style guide somewhere. The benefit is that a reader will find out up-front if they are reading instructions for the thing they want to do. So I would change this to "To search for available languages, enter text into the field under "Add a language". Available languages matching the entered text will display in a dropdown. To add add a language to your project, select the desired language from the dropdown."