According to Google's material design guidelines, a typical dialog with two actions looks like this:
The title and the text is normal, but what I find interesting is using all-caps letters for the actions.
In the guidelines, it doesn't address this point directly. But, in the case of languages without letter capitalization, it says:
For languages without capitalization (such as Chinese, Japanese or Korean), it is important to maintain consistent placement, spacing, and colors for actions to distinguish them from regular text.
So I assume the main reason is for distinction from regular text.
But as users in the above languages (my own language as well) have no problem recognizing the actions, I was wondering why it should be capitalized in English and similar languages?
And, what other reasons can be behind this guideline?