Add classes for /weakness command's labels
Add classes for /weakness command's labels

This adds in style for the new labels for the /weakness command, so that "Weaknesses:" is coloured red (the same as the red for .message-learn-cannotlearn for consistency reasons), "Resistances" is coloured blue, and "Immunities" is coloured grey. This reflects the changes to the command made in this pull request: https://github.com/Zarel/Pokemon-Showdown/pull/1116
QuiteQuiet/Pokemon-Showdown-Client,submindraikou/Pokemon-Showdown-Client,sirDonovan/Pokemon-Showdown-Client,asgdf/Pokemon-Showdown-Client,QuiteQuiet/Pokemon-Showdown-Client,Zarel/Pokemon-Showdown-Client,sirDonovan/Pokemon-Showdown-Client,QuiteQuiet/Pokemon-Showdown-Client,panpawn/Gold-Client,submindraikou/Pokemon-Showdown-Client,Zarel/Pokemon-Showdown-Client,asgdf/Pokemon-Showdown-Client,asgdf/Pokemon-Showdown-Client,Zarel/Pokemon-Showdown-Client,panpawn/Gold-Client,panpawn/Gold-Client,submindraikou/Pokemon-Showdown-Client,QuiteQuiet/Pokemon-Showdown-Client,sirDonovan/Pokemon-Showdown-Client,asgdf/Pokemon-Showdown-Client,Zarel/Pokemon-Showdown-Client,sirDonovan/Pokemon-Showdown-Client