This members-only tutorial provides the code for registering a custom condition using which elements in Oxygen can be set to be output if the visitor's browser language matches the specified string in the condition.
We shall make == and contains operators be available.
== is for exact match incl. the region code. This is case-sensitive.
contains is for loose match i.e., just the language without the region.
Step 1
Create a new snippet in your favorite code snippets plugin (mine is WPCodeBox).