Eea.dexterity.indicators

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* Refactor: Remove institutional_mandate
[avoinea - refs 256516]
* Bug fix: Description maxChars, required
[avoinea - refs 253800]
* Refactor: Cleanup ShortName behavior already in Plone 5+
[avoinea - refs 145772]

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* Refactor: Migrate taxonomy_themes to EEA Core metadata topics field
[avoinea - refs 256153]

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* Bug fix: Fix accordion block allowed blocks
[avoinea - refs 145772]
* Bug fix: dedupe data sources and IMandate basis of urls
[nileshgulia1 - refs 255438]

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* Refactor: Drop Python2 / Plone 4 support
[avoinea - refs 253802]

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* Change: Avoid duplicate urls by removing api substring
[iulianpetchesi - refs 157787]

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* Change: Update Indicator Fixed layout to prepare for Plone 6 migration
[avoinea - refs 145772]