Thank you, for considering helping out with localizing our favourite Blogging / Content Management platform software to Canadian English (locale code en_CA).
The Core, Meta, and Polygots WordPress community are making WordPress even more friendly and local for end users and all translatable themes and plugins are now being uploaded to GlotPress. GlotPress is a web-based translation tool that is used for automatic language pack creation and distribution. If you have a WordPress.org login you can translate strings here https://translate.wordpress.org/locale/en-ca if not you can create one at https://wordpress.org/support.
Core WordPress is built in American English (locale code en_US), most plug-ins and themes are as well or are assumed to be by WordPress. We need lots of help to translate thousands of text strings. For 99% of them they will be just a copy of the original string. If they can be made more Canadian then here is the basic guide. Anyone can help from anywhere at any time, if your translations are good, we may choose to invite you to be a Translation Editor (TE) which will mean your strings will not need validation, and you can validate the strings from others. If you are a plug-in author and you want to have TE access we have a guide on how we handle these requests.
Names of cities used in examples like “Los Angeles” is replaced with a Canadian community name. We tend to change the city name from time to time to not show bias. However, it is usually a Canadian city that has hosted a WordCamp.