Account for verb conjugation (e.g. "likes" vs "like")

[liweiyap]

Describe the bug
When the same post is liked by multiple connections, and the checkbox "Hide liked by connections" is checked, then the post will not be hidden.

This is because we push only 'likes this' to keywords. We should also push 'like this'.

To Reproduce
Steps to reproduce the behavior:

1. Make sure that the LinkOff extension is enabled, and the checkbox "Hide liked by connections" is checked.
2. Go to LinkedIn home page and wait for LinkOff to finish hiding posts.
3. Any post with the status "ABC likes this" is hidden by the LinkOff extension. But any post with the status "ABC and XYZ like this" is not hidden by the LinkOff extension.

Expected behavior

• Any post with the status "ABC likes this" is hidden by the LinkOff extension.
• Any post with the status "ABC and XYZ like this" is also hidden by the LinkOff extension.

Environment (please complete the following information):
It doesn't really matter, because I expect all OS's and browsers to be affected by the same code, but...

• OS: MacOS
• Browser: Chrome
• Version: 1.2.1

Additional context
We should also check if LinkedIn conjugates the following verbs: "loves", "finds", "celebrates", "is".