Support ICUString with placeholders

[michael-wirth]

Plurals class fails to parse ICU strings with placeholders correctly.
https://github.com/transifex/transifex-java/blob/devel/TransifexNativeSDK/common/src/main/java/com/transifex/common/Plurals.java#L50

Source: {???, plural, one {{{count }} ONE } other {{{count }} OTHER }}

Actual:

Result: Plurals{zero='null', one='{{count', two='null', few='null', many='null', other='{{count'}

Expected:

Result: Plurals{zero='null', one='{{count}} ONE', two='null', few='null', many='null', other='{{count'}} OTHER}

[michael-wirth]

The following regex pattern with a positive lookahead might fix the issue.

"(zero|one|two|few|many|other)\\s+\\{(.+?)\\}(?:(?=\\s+(?:zero|one|two|few|many|other) \\{)|\\}\$)"

[Petrakeas]

The plurals ICU string implementation in the SDK is a really simple one to allow the conversion between Android's plurals and the ICU plural format used by Transifex.

If the implementation improved to support placeholders, how would they be utilized in Android?