In brief
font-weight selects weight, but available faces depend on the chosen family. Specifying 700 does not establish that a separate font file of that weight has loaded.
Useful to know
font-weight selects weight, but available faces depend on the chosen family. Specifying 700 does not establish that a separate font file of that weight has loaded. [1]
If bold text looks unexpected, inspect available faces and font declarations. Compare actual text in both languages, since visual weight is not universally equivalent across font families.
Sources
For further detail and to check the information: