Language Coverage
Most apps in a search result ship one language. The leaders ship twenty. This puts the languages your app declares next to the 25 apps you share a result with, and names the ones they have that you do not.
What the spread actually looks like
Measured live on one US search result for “habit tracker”, the 23 apps returned declared: 1, 1, 1, 1, 1, 1, 1, 1, 2, 5, 7, 8, 8, 9, 9, 10, 10, 15, 19, 22, 28, 28 and 40 languages. Eight of them ship a single language and one ships forty. Which end of that a result is competing at is not visible from any product page.
Note what this measures: the languages compiled into the app itself, which is a different fact from whether the App Store listing is translated. For that, use the localization audit.
Sampled across 2,110 apps from 47 live search results, Apple returned a language list for all but one. The one is reported as missing data, never as an app with no languages.