[4.4] Finder: Fixing language of token

[Hackwar]

Summary of Changes

While debugging another issue, I stumbled upon a problem where the language handed over for a token while indexing is being set to NULL. For this to happen, Finder needs to be set to search for phrases. In that case, the changed line applies the stemming code to each token, but since $lang is only a single entry array, that variable is only applied once for the array of tokens. The token array can have between 1 and 3 entries and thus the stemmer for $lang is only applied for the first token and not the rest of the array.

Testing Instructions

Codereview.

Link to documentations

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