The ornamental design for an applicator, as shown and described.
FIG. 1 is a front perspective view of an applicator showing a first embodiment of our new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a right side elevational view thereof;
FIG. 5 is a left side elevational view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof; and,
FIG. 8 is a bottom plan view of an applicator showing a second embodiment thereof, the only difference between the two embodiments being in the bottom plan view, with the broken-line disclosure being understood to represent a portion of the article in which the claimed design is embodied, but which forms no part of the claimed design.