[#0] FAQ Followup + various small bugs

[Vynny]

• [X] If bot gets a FAQ question last message will be a prompt indicating that the user can continue to ask questions
• [X] Added a bit more training data for the acknowledgements
• [X] Fixed a response to make it sound a bit more natural

[codecov[bot]]

Codecov Report

Merging #434 into master will not change coverage. The diff coverage is 0%.

@@          Coverage Diff           @@
##           master    #434   +/-   ##
======================================
  Coverage    71.1%   71.1%           
======================================
  Files          54      54           
  Lines        2291    2291           
  Branches       24      24           
======================================
  Hits         1629    1629           
  Misses        661     661           
  Partials        1       1

Impacted Files	Coverage Δ
src/nlp_service/services/response_strings.py	100% <ø> (ø)	:arrow_up:
src/nlp_service/controllers/nlp_controller.py	0% <0%> (ø)	:arrow_up:

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