Add display name for PhysicalSwitch model

[mzazrivec]

Added both into locale/en.yml and the model itself.

[miq-bot]

Checked commit mzazrivec@150c367 with ruby 2.3.3, rubocop 0.52.1, haml-lint 0.20.0, and yamllint 1.10.0
1 file checked, 0 offenses detected
Everything looks fine. ⭐

[Fryguy]

@mzazrivec Is there any way we could write a spec to detect this for future models, or does that not make sense.

[mzazrivec]

@Fryguy Only certain models require to have display_name() defined: usually those that appear in reports and those which appear in UI in some shape or form (have their own controller, right cell text, are rendered in flash messages, etc.)

Automatic detection here would be quite difficult (and probably not 100% reliable).