Template:Babel/doc

Language code
Recognized language codes are:

Language proficiency
Recognized profiency levels are:
 * 0 for does not understand,
 * 1 for basic,
 * 2 for intermediate,
 * 3 for advanced,
 * 4 for near-native,
 * 5 for professional,
 * N for native speaker.

Example 1
results in:

Example 2
results in:

Example 3
results in: