[Bug] Syllables containing "у" sound are pronounce as "оу" in "Слоги Королёвой/Гласные А-И-У"

[HappyEgoiste]

Precondition:

1. Log in as default2 user ([email protected] / password)

Steps to reproduce:

1. Go to https://brainup.site/groups/1/series/18/subgroup/142/
2. Click on exercises 3, 5, 13 (https://brainup.site/groups/1/series/18/subgroup/142/exercise/1980, https://brainup.site/groups/1/series/18/subgroup/142/exercise/1982/task/1970, https://brainup.site/groups/1/series/18/subgroup/142/exercise/1990/task/1978
3. Press the red play button.

Actual result: Syllable "бу" is pronounced as"боу" (exercise 3). Syllables "гу" is pronounced as"гоу" (exercise 5). Syllables "пу" is pronounced as"поу" (exercise 13).

Expected result: Syllable "бу" is pronounced as "бу" (exercise 3). Syllables "гу" is pronounced as "гу" (exercise 5). Syllables "пу" is pronounced as "пу" (exercise 13).