lxqt-config-input: Add remaining missing colons to labels

[isf63]

Append colons to the remaining (two) labels.

[stefonarch]

Same here, need to remember how I did in lxqt-session.

[stefonarch]

Needs a good recheck, specially for RTL languages, used this in translation DIRs

  sed -i 's/Size/Size:/g' *.ts
  sed -i '/Size/{n;s/<\/translation>/:<\/translation>/g}' *.ts
  sed -i 's/unfinished\">:/unfinished\">/g' *.ts

  sed -i 's/keyboard\ settings/keyboard\ settings:/g' *.ts
  sed -i '/keyboard\ settings/{n;s/<\/translation>/:<\/translation>/g}' *.ts
  sed -i 's/unfinished\">:/unfinished\">/g' *.ts
  cd ../..
  lxqt2-transupdate 

[isf63]

Will re-check; these are very annoying but the end result is good, thanks for helping.

[isf63]

Scanned them - both _en_GBs have errors and one _cy

[isf63]

Checked again and fixed a couple mistakes. For RTL languages having : at the end is correct as the entire strings are reversed.