Semor, your log looks like you've installed a hell lot of mods to your game already. There are many errors pointing to missing statics files, but the one that crashes your game is this one:
[16:35:33] INTERNAL ERROR: Can't open file '3DO/Plane/Fw-190D-9(Beta)/Jacket_LW_256.mat'
[16:35:33] WARNING: object '3DO/Plane/Fw-190D-9(Beta)/Jacket_LW_256.mat' of class 'TMaterial' not loaded
[16:35:33] INTERNAL ERROR: Material: Can't load 'Jacket_LW_256.mat'
[16:35:33] Mission error, ID_04: java.lang.RuntimeException: INTERNAL ERROR: Material: Can't load 'Jacket_LW_256.mat'
[16:35:33]
[16:35:33] java.lang.RuntimeException: INTERNAL ERROR: Material: Can't load 'Jacket_LW_256.mat'
Now that there's no "3DO/Plane/Fw-190D-9(Beta)/Jacket_LW_256.mat" file in any of the SFS archives being part of stock 4.12,
if this was an issue it would have to happen on stock 4.12 as well. I'd rather guess that you just installed an incompatible mod though.
I installed it nice and steady but now the game is in french, and as french as I am I'd rather have it in english, how do I proceed to do so ?
Nothing easier than that.
Showing the UI in your native language is another new feature in Modact 5, this should get us rid of hand-crafted translations of all those ".ru" files as we used to have before.
However in cases like yours you can easily override this behaviour.
Open your conf.ini, look for the "[rts]" section and edit/add the "locale" entry (if there is no "locale" set in [rts] section, the game will default to your system language).
For instance, if you want your game to show english language, set the following "locale" property:
[rts]
locale=en
That's it, now your game is english. You can use other locale settings for different languages such as german (de), hungary (hu), czech (cs), polish (pl) etc.
Best regards - Mike