Edit changelog messages

[reuvenharrison]

I suggest two changes to these messages:

1. display both orignal and new value
2. a nicer way to say it

for example:
the %s request property's maxLength was increased to %s
will become:
for the %s request property, maxLength was increased from '%s' to '%s'

Originally posted by @reuvenharrison in #345 (comment)

[blva]

We should think of how we can inform this to customers so they can update err/warn files, or maybe add a solution/script to update changed phrases.