If you are running a custom theme, there is a good chance that the 1.1.9 patch will not be able to update your theme files. The theme will still work w/o the updates, it will just lack the new functionality. Below is how you would make the edits to update the like names.
In previous releases the like / unlike button had (3) CSS class names of
.like_button
.unlike_button
.likes_button
The problem is ad blockers would strip these out (hiding the button) as they were interpreted as social icons/links. To work around this the class names were changed from "like" to "react" as follows
.react_button
.unreact_button
.reacts_button
As such in your custom theme, you should add the new classes (or replace, your choice) with the new names wherever they appear. For example
.like_button:before {
changes to
.like_button:before, .reacts_button:before {
There will be several of these in your index.css and possibly some in your color variant file.