[solved] diacritics/diuresis in linux

In Linux, we need the unicode number, and then convert it to hexidecimal. So for example, for ä, the unicode is 0228. Once converted to hex, it becomes 0e4.

To enter... 1) Ctrl-Shift simultaneously with the letter "u". That leaves an underlined "u" in the text. 2) type the last two or three digits of the hex code, eg...

á = 0e1
é = 0e9
ñ = 0f1
ä = 0e4
ö = 0f6
ü = 0fc
° = 0b0

...and 3) Enter or Spacebar.

chromium

Specific to Chromium, we often find Cyrillic or Chinese symbols are replaced by boxes. In such cases, we have to go to the evil Adobe empire. So, for example, for some of the Chinese fonts...

# pacman -S adobe-source-han-sans-otc-fonts

...but one simply needs to search on "adobe-source" and one will find their language. Close and reopen Chromium once complete.