Explain text should appear instead of this.

You are about to run out of memory.  Is it OK to close the window “{{1:%P}}” which you were editing but already saved changes for?

You are about to run out of memory.  Is it OK to close the empty message window “{{1:%P}}”?

You are about to run out of memory.  Is it OK to close the message window “{{1:%P}}”?