refactor: add the correct english text for the community sidebar

Author: serapieTuyishime

public/locales/en/common.json

@@ -113,9 +113,9 @@
   "communities.submission": "Submission",
   "communities.challenge.title": "Challenge",
   "communities.overview.challenges.title": "Challenges",
-  "communities.overview.challenges.description": "In the courses of this community, you will be able to learn about new technologies, solve challenges, get feedback, and earn bounties.",
+  "communities.overview.challenges.description": "In challenges, you can tackle practical tasks, receive constructive feedback, and earn bounties for your achievements.",
   "communities.overview.learning-materials.title": "Learning materials",
-  "communities.overview.learning-materials.description": "In the courses of this community, you will be able to learn about new technologies, solve challenges, get feedback, and earn bounties.",
+  "communities.overview.learning-materials.description": "In the learning materials, you can explore a variety of courses and short modules to learn about new technologies and enhance your skills.",
   "communities.overview.challenge.title": "Already ready to complete the challenge?",
   "communities.overview.challenge.rewards": " Rewards",
   "communities.overview.challenge.certificate": "Certificate",