-1
The yellow in question is in fact a lint brand indicating a possible problem or improvement that can be applied in your code. You can read more about how lint works on documentation, as well as ways to configure it.
Usually warnings can be ignored, but the ideal is to read them, understand the possible implications of the indicated problem, and apply the necessary corrections. Even, some fixes can be applied automatically when pressing alt+enter
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In this specific case, lint is probably indicating to use string Resources, which, among other advantages, facilitates the translation of your app into other languages.
He’s probably recommending using string Resources formatted.
– Leonardo Lima
In this case yes, but this label appears randomly and usually in xml files
– Luis Felipe