Content fixes to be propagated to all translations

[Atcold]

#127 2020.03.24 02-2

• [x] zh → #168
• [ ] ko
• [ ] it
• [ ] es

#157 2020.03.27 01-1

• [x] zh
• [x] ko
• [x] it
• [x] es

#171 2020.03.28 02-1

• [ ] zh
• [ ] ko
• [ ] it
• [ ] es

#185 2020.03.30 02-2

• [ ] zh
• [ ] ko
• [ ] it
• [ ] es

0e6e044a05c8f05a585c5d04d0aa22f6a3a3fcab 2020.04.01 02-1 More math cleaning required!

• [ ] zh
• [ ] ko
• [ ] it
• [ ] es

#236 2020.04.13 03-2

• [x] zh
• [ ] ko
• [ ] it
• [ ] es

#778 2021.05.04 02-2

• [ ] zh
• [ ] ko
• [ ] it
• [ ] es
• [ ] fa
• [ ] fr
• [ ] ja
• [ ] tr

[seungjaeryanlee]

Friendly reminder to @dohppak for Korean translation.