|public static java.lang.String||addLikelySubtags(java.lang.String locale)|
Add the likely subtags for a provided locale ID, per the algorithm described in the following
CLDR technical report:
If locale is already in the maximal form, or there is no data available for maximization,
it will be just returned. For example, "und-Zzzz" cannot be maximized, since there is no
"en" maximizes to "en_Latn_US"
"de" maximizes to "de_Latn_US"
"sr" maximizes to "sr_Cyrl_RS"
"sh" maximizes to "sr_Latn_RS" (Note this will not reverse.)
"zh_Hani" maximizes to "zh_Hans_CN" (Note this will not reverse.)