The backlash (\) character is not displayed as a yen symbol in Japanese games

[Mimigris]

Name of the game:

Ultra Violet version 0.0551.

Player platform:

Windows, 64 bits continuous build of the Player.

Describe the issue in detail and how to reproduce it:

This is an old regression: it was displayed as intended in version 0.4.0 and the regression occurred in version 0.4.1, as mentioned here.
When the backlash (\) character is displayed in a game (by typing \\ as text) in a Japanese game, the character is displayed as \ instead of a yen character which should be displayed due to how Japanese computers work.
Example with the map 102 of Ultra Violet (left is RPG_RT, right is EasyRPG):