fix: title case in menus

[mistercrunch]

Let's stick to title case in the navbar. This tackles two entries that
have been triggering my OCD

[codecov]

Codecov Report

Merging #17135 (3ca3fd2) into master (e32a12f) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #17135   +/-   ##
=======================================
  Coverage   76.70%   76.71%           
=======================================
  Files        1031     1031           
  Lines       55155    55174   +19     
  Branches     7499     7499           
=======================================
+ Hits        42307    42324   +17     
- Misses      12596    12598    +2     
  Partials      252      252           

Flag	Coverage Δ
mysql	81.93% <ø> (+<0.01%)	⬆️
postgres	81.94% <ø> (+<0.01%)	⬆️
python	82.02% <ø> (+<0.01%)	⬆️
sqlite	81.61% <ø> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
superset/initialization/__init__.py	87.90% <ø> (ø)
superset/db_engine_specs/bigquery.py	84.75% <0.00%> (-1.22%)	⬇️
superset/views/base.py	75.00% <0.00%> (ø)
superset/connectors/sqla/models.py	85.61% <0.00%> (+0.01%)	⬆️
superset/config.py	91.47% <0.00%> (+0.02%)	⬆️
superset/views/core.py	76.94% <0.00%> (+0.03%)	⬆️
superset/views/database/views.py	88.46% <0.00%> (+0.04%)	⬆️
superset/connectors/base/models.py	88.25% <0.00%> (+0.11%)	⬆️
superset/utils/core.py	89.97% <0.00%> (+0.13%)	⬆️

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[jayakrishnankk]

LGTM

[villebro]

LGTM

[rusackas]

I'm all for consistency, so this was good for a while. Just noting here that we should follow the capitalization guidelines and convert basically all of these to sentence case. This came up on another PR and we'll probably steer toward that change there.