Add more categories to partsOfSpeech list
Add more categories to partsOfSpeech list

-Prepositional phrase
-Idiom
-Initialism
-Proverb

Needed to prevent 404s for certain terms.

E.g.:
https://en.wiktionary.org/wiki/ar_amharc
https://en.wiktionary.org/wiki/synge_p%C3%A5_siste_verset
https://en.wiktionary.org/wiki/FH
https://en.wiktionary.org/wiki/spoil_the_ship_for_a_hap%27orth_of_tar

Change-Id: Idf1abe2239208fba2f844368114d4ede2cf7efa2

wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps