Improve Turkish word list quality

[Hugo0]

Problem

The Turkish word list contains many conjugated verb forms (e.g. "besle" = imperative of "beslemek"). This causes:

• Missing Wiktionary definitions (workaround added in c6c42dc to try infinitive suffixes)
• Less recognizable words for players

Suggestions

• Review word list for heavily conjugated forms and consider replacing with base forms or common nouns
• Consider sourcing from a frequency list of Turkish lemmas
• Cross-reference with Turkish Wiktionary coverage to maximize definition availability

Context

Current workaround: webapp/wiktionary.py tries appending -mek/-mak for Turkish/Azerbaijani when direct lookup fails.