Problem

Chained formatters support parenthesised options that may contain the format separator, for example join(separator: ', '). When such a formatter is split on the separator, the option fragments have to be rejoined before parsing.

Today that reassembly only runs for formats[0]. A formatter whose parenthesised options contain the separator therefore works only when it is first in the chain:

// works
{{v, join(separator: ', '), uppercase}}

// broken: corrupt output
{{v, uppercase, join(separator: ', ')}}

In the broken case the join(separator: ', ') fragment is split into join(separator: ' ' and ')', never rejoined, and the value comes out corrupted (e.g. ANaNB).

Fix

Replace the formats[0]-only repair with a single position-independent pass: walk the split fragments and, whenever a fragment opens a paren that is not yet closed, keep appending following fragments (re-inserting the separator) until the paren closes. This reassembles comma-in-parens options at any position in the chain. The downstream formats.reduce(...) is unchanged.

Tests

Added a regression test in test/runtime/i18next.translation.formatting.test.js exercising a chain where the comma-in-parens formatter is not first ({{myVar, upper, join(separator: ', ')}} with ['a','b'] -> A, B).

• Before the fix, the new test fails (Hello ANaNB).
• After the fix it passes, and the full runtime suite stays green.