%s1, %s2, .... %s[n] refers to the "input text" that the localization can take. Similar to how printf works in C... except only strings are allowed.
This allows us to have translated sentences that include numbers and stuff.
For the example you cited, it forms an introduction to the following tip. Example:
"Radar Tip:"
"Weak Weapons Tip:"
etc.
So all you have to translate is the "Tip" part... then translate the titles below that separately.