Added support for phase sub text in phase selector

[olemp]

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Description

Added support for phase sub text in phase selector.

Same property PhaseSubText as in prosjektportalen, with fallback to PhasePurpose in case someone is using that today.

How to test

See #371

• Create a new project
• Verify correct PhaseSubText when mouse over each Phase indicator
• Verify that correct PhaseSubText is displayed on screen
• Change PhaseSubText in TermStore and verify updated text within the project
  Edit page and select webpart editor for Phase webpart.
• Toggle "Vis fasetekst"; republish page and verfiy indications
• With "Max lengde fasetekst" verify correct behavior (Test with both low / high number of characters)

Relevant issues

Closes #371

[pzljanb]

Konsept phase indicator (and TermStore) has PhaseLetter = 'X' in the 1.2.6 instance within Puzzlepart tenant.
Is this as a result from the installation package from GitHub, or from a manual update within this installation?
In case the installation package from GitHub contains the letter 'X'; this should be updated to 'K'
@olemp

[olemp]

Konsept phase indicator (and TermStore) has PhaseLetter = 'X' in the 1.2.6 instance within Puzzlepart tenant.
Is this as a result from the installation package from GitHub, or from a manual update within this installation?
In case the installation package from GitHub contains the letter 'X'; this should be updated to 'K'
@olemp

Manual update in the tenant.

[danielwiese]

Solution looks good 😊👏