Add proper formatting for labels

These are only examples, but they look in my opinion better than the current solution: x < y (read: x is inferior to y)

• lowerPercentile(Example Group) < Lower Percentile (Example Group)

• Lower Percentile < 5 % or Lower %

• Upper Percentile < 95 % or Upper %

• mean+std(Example Group) < Mean + Std.Dev (Example Group)

• Mean + Std.Dev (Example Group) < μ - σ =