Helo Velas,
let me recommend you the section Localize a font resource if you don't know it yet. The interesting aspect explained in this section is that in case of a font resource configured even with different language specific values, the system generates from this information one single font.
Does Chinese get thoses common caracters generated for it too?
Yes, this is the result of the above mentioned functionality. You get one font with glyphs composed for language English, German and Chinese. The text displayed with this font can thus contain any combination of the English, German and Chinese characters - all in one string. Note the figure below which is found in the above mentioned documentation:
If yes, is there a way to specify it? I tried to specify it for german and english only, but it creates conflict in font glyph (a warning in EW).
See the mentioned documentation. The warning message probably informed you about an overlapping (conflict) in Ranges attribute. If this is the case, please note that in the finally resulting font, each glyph is 1 to 1 related to a single character code. If you specify the same character code twice in different language variants of the attribute Ranges, this will report a warning.
I should add that, right now, with several glyphs that are shared between chinese and japanese, putting it in Default range does not display properly (it display a vertical rectangle).
I suppose the font specified in the variant Default does not contain the Chinese glyphs. For example, if the Chinese glyphs should be taken from a font named e.g. 'Noto SC', select 'Noto SC' in the Chinese variant of the FontName attribute AND configure the Chinese character ranges in the Chinese variant of the Ranges attribute. Both have to correlate.
I hope it helps you further.
Best regards
Paul Banach