Function languageRelatedness

Computes a relatedness score between two language codes. Higher is better. 0 means unrelated.

• 4: exact match after normalization (e.g. en-US vs en-US)
• 3: candidate is parent of target (e.g. en vs en-US)
• 2: candidate is sibling of target (e.g. en-CA vs en-US)
• 1: candidate is child of target (e.g. en-US vs en)
• 0: unrelated