HEOS confirm discovered devices before adding

[andrewsayre]

Description:

Modify the HEOS discovery config flow to show a host selection form as a step to confirm setup. Previously, the integration would setup a config entry without asking the user using the first host discovered. PR also fixes 2 issues in the strings.

Checklist:

• The code change is tested and works locally.
• Local tests pass with tox. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.

If the code does not interact with devices:

• Tests have been added to verify that the new code works.

[codecov]

Codecov Report

Merging #23063 into dev will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##              dev   #23063      +/-   ##
==========================================
+ Coverage   93.93%   93.94%   +<.01%     
==========================================
  Files         451      451              
  Lines       36759    36765       +6     
==========================================
+ Hits        34531    34538       +7     
+ Misses       2228     2227       -1

Impacted Files	Coverage Δ
homeassistant/components/heos/config_flow.py	100% <100%> (ø)	⬆️
homeassistant/components/heos/const.py	100% <100%> (ø)	⬆️
homeassistant/components/aws/const.py	100% <0%> (ø)	⬆️
homeassistant/helpers/translation.py	98.73% <0%> (+0.03%)	⬆️
homeassistant/components/uk_transport/sensor.py	94.16% <0%> (+0.72%)	⬆️

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[balloob]

Ok to merge when comments addressed

[andrewsayre]

Comments addressed and build passing. Merging!