UnicodeDecodeError if Directory Contains Special Characters

[msom]

A directory with a membership and a special character (e.g. 'ü') in the title leads to an UnicodeDecodeError when filtering for organizations in the people list:

  ...
  Module seantis.people.browser.list, line 93, in people
  Module seantis.people.content.list, line 100, in people
  Module Products.CMFPlone.CatalogTool, line 393, in searchResults
  Module Products.ZCatalog.ZCatalog, line 604, in searchResults
  Module Products.ZCatalog.Catalog, line 925, in searchResults
  Module Products.ZCatalog.Catalog, line 545, in search
  Module Products.PluginIndexes.common.UnIndex, line 403, in _apply_index
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 0: ordinal not in range(128)

Furthermore:

• The organization filter in the people list is not updated (reindexing the seantis_people_catalog required)

[msom]

The problem seems to be that some descendants of seantis.people use unicode for the filterable fields (e.g. seantis.translators: written_languages) while other (such as seantis.people/seantis.agencies: organizations) use strings. We should use only unicode for filterable fields.