[#854] Ignore surveyed locale if no `surveyedLocaleId` present
Merge pull request #856 from akvo/issue/854-missing-survey-instances

[#854] Ignore surveyed locale if no `surveyedLocaleId` present
[#813] Return `Collection` object for display name questions
[#813] Returning `List` object

* Based on review from @jonase
Merge pull request #859 from akvo/issue/813-ordering-display-name

[#813] Return `List` object for display name questions
[#861] Explicitly use UTF-8 encoding
[#863] Release Notes 1.7.5
Merge branch 'release/1.7.5'
Merge branch 'master' into develop