fix(frontend): rename search by thread (#3099)

# Description

Please include a summary of the changes and the related issue. Please
also include relevant motivation and context.

## Checklist before requesting a review

Please delete options that are not relevant.

- [ ] My code follows the style guidelines of this project
- [ ] I have performed a self-review of my code
- [ ] I have commented hard-to-understand areas
- [ ] I have ideally added tests that prove my fix is effective or that
my feature works
- [ ] New and existing unit tests pass locally with my changes
- [ ] Any dependent changes have been merged

## Screenshots (if appropriate):

frontend/lib/components/Menu/components/DiscussionButton/DiscussionButton.tsx

@@ -22,7 +22,7 @@ export const DiscussionButton = (): JSX.Element => {
       onClick={handleClick}
     >
       <div className={styles.left_wrapper}>
-        <span>New Search</span>
+        <span>New Thread</span>
         <div className={styles.shortcuts_wrapper}>
           <div className={styles.shortcut}>⌘</div>
           <div className={styles.shortcut}>K</div>