Font on some UI elements displayed blurry

When you using custom font some menu elements displayed using blurry font.

Affected version: MCW10E 1.0.0, MCPE 1.0.0 (Android).

How to reproduce:
1. Install and apply resource pack: https://mods.curse.com/mc-addons/minecraft/253146-minecraft-font
2. Restart Minecraft
3. Choose language that contain non-latin characters. Russian for example.
3. Start Minecraft and check menu items. If everything is fine try to change GUI Scale.