First argument of t() is not a literal string

In some calls to t() the module doesn't pass a literal string, which means the string to translate will not be extracted from the script to extract them, and therefore the passed string will not be translated.
Considering that those strings are used in the Opensearch description file, is there really the need to translate them? If then we consider that the description file is required by a search engine (a.k.a. an anonymous user), it is more probable that the strings would be in English, even if they could be translated.