Merge: Review errors messages
A big PR but that just review the errors and warning messages printed by the tools.
I tries to follow a standard format:
eg. "Error: cannot find method `foo`."
* start with a message type like "Error:", "Syntax Error:", "Warning:".
The type is capitalized and terminated by a column.
The rest on the message starts with a lowercase letter and is terminated with a dot.
* be short and fit on a single line.
* have meaningful information first.
This helps the reader and remain usable
when truncated, by an IDE for instance.
* enclose identifiers, keywords and pieces of code with back-quotes.
Do not hesitate no nitpick phrasing or wording or propose better messages.
Close #931
Pull-Request: #1253
Reviewed-by: Alexandre Terrasa <alexandre@moz-code.org>
Reviewed-by: Alexis Laferrière <alexis.laf@xymus.net>