v0.5.2.4

We have fixed a bug that caused that only normal quality weapons could be produced.
We have fixed a bug in the transmissions of the mission Presentations (#224).
We have fixed an audio error in one of the transmissions of the mission Towards The Dome (#175).
We have fixed a bug in a button of the mission Sol Invictus (#299) that closed the text window.
We have fixed a bug that gave wrong bonuses when upgrading a system installed on the ship.
We have added a missing icon in the wingmen with the Mercury Oxygen ship.
We have fixed some translation errors.
We have improved the font style of many Russian texts.
We have fixed a several grammar errors.