MediaWiki:Translate-magic-help - error in English version
In MediaWiki:Translate-magic-help/en I think that "form valid expression" should be "form a valid expression".
Maybe the paragraph would read a little easier if it said:
In namespaces translating the project talk namespace $1 talk may be complicated. $1 is replaced with the project sitename (for example Project talk). If it is not possible in your language to form a valid expression without changing the sitename, please contact a developer.
The qqq file could then advise not to translate either $1 talk or Project talk.
