Fix string puzzle with list and grid view placeholder strings

Using a placeholder for the type of data in the string doesn't work because of grammatical genders and other differences from English.

The UI code is implemented in a very generic way, which is good overall, but it prevents us from easily defining a different string for every that it could be displaying, which would be the best way to solve the string puzzle.

Accordingly, this commit takes the lazy path by just setting the placeholder text to a status string with no substitutions. The message is more generic, but always translatable.