What has Base64 encoding/decoding to do with model ripping?

You can use some portable hex editor. Actually it doesn't matter if you install it or not.
And it is "binary". It's not plain text, and it contains also non-printable characters.

So what you can do? I don't know.

Use a hex editor.
It looks like binary/compiled form of some text script file.

.\rapture\gamedata.pak\Libs\UI\fontbody.gfx

It contains 3 fonts.

Yes, I also had problems with crashing. Unfortunatelly I don't know what was the problem, but I somehow made a modified English.lngp, which actually works

Did you delete LocalizationBinFonts folder after lngp editing?

Forget on modifying binfonts. They would be re-written by game, when player choose another language in Settings. You need modify included TTF fonts in .lngp pack. LNGP consist of: 1) info header 2) text (same text, same format as .lang files, but at this moment game doesn't read included text in .ln...

Just for quick view on binfont content. It was not tested on every generated binfont. (v2.0.3 game uses TTF/OTF fonts from *.lngp in LocalizationPacks folder) # This War of Mine (v 2.0.3) # BINFONT to DDS converter # by MerlinSVK Mar 2016 # version 1.2 # script for QuickBMS http://aluigi.org/papers....

Here, my BIN packer, made in AutoIT.

http://www65.zippyshare.com/v/4kXkNyYT/file.html

Put there original file and start experimenting.

Why you don't try it by yourself? Don't change the length of sentences and you will know if there is some limitation.

In Photoshop http://img4.uploadhouse.com/fileuploads/22229/22229444-holder-2e58f32afad065a37892bcd6b2a037f4.jpg In GIMP + DDS plugin http://img5.uploadhouse.com/fileuploads/22229/22229445-holder-d0646533a76c73cacc6cb14a51f7afa6.jpg BTW you don't need that "NVTT" mark, but if you want ,you...

It works in latest game version, I had an older one (with some localization bugs).

Well, it seems that you are lucky. It doesn't work with Slovak language.

Did you try it? Because, if you use non-cyrillic letter in russian text section, game will fallback into english. And again, it's not english from resouces.assets.