Warning Messages

I have a specific product, and the user have to select the color before adding it to the cart, currently when I try to add it to the cart without selecting the color the message shows tells " ADD TO CART FAILED DUE TO FOLLOWING WARNINGS Color".

my question is how can I show the proper message that tells the user to select the color first?? how can I do this using admin portal only (No coding) for V3.9?

same thing for quantity, when the added quantity exceeds the available quantity in the stock, tells " ADD TO CART FAILED DUE TO FOLLOWING WARNINGS Your quantity exceeds stock on hand. The maximum quantity that can be added is 600.
"

My v3.9 worked fine and displays the message defined in the Text Prompt for the attribute
i.e. Please Select Color
I tried different Control types - Dropdrowm, Checkbox and Color Selector - all worked fine

The messages are displayed at the top of the screen in the Red error Bar

For the quanity case it displays the message - The maximum quantity allowed for purchase is 2.

So is it a standard v3.9 not customised ?

what do you mean by standard?
I'm working on this site for a while, and I've changed the template for Uptown template, but it is the same issue with Default template.

ok, I've found that the problem was because of Ajax Cart plugin, the "Enable Nop Ajax Cart and Ajax Wishlist on Product Page" checkbox in "Ajax Cart Availability Settings" tab should be unchecked.

now my question is, where can I edit the text of warning message that is related for a specific attribute?