Updated the CHANGELOG file for milestone 3.14.0 to include the remaining changes made in this milestone.

[MohitMaliFtechiz]

• Updated the CHANGELOG file for milestone 3.14.0 to include the remaining changes made in this milestone.
• Corrected some English mistakes in the CHANGELOG file.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 57.21%. Comparing base (cd67d40) to head (15bb7d8).
Report is 10 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #4221      +/-   ##
============================================
- Coverage     57.61%   57.21%   -0.41%     
+ Complexity     1590     1585       -5     
============================================
  Files           316      316              
  Lines         13765    13765              
  Branches       1726     1726              
============================================
- Hits           7931     7875      -56     
- Misses         4648     4710      +62     
+ Partials       1186     1180       -6     

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