Update SMW_LanguageNb.php

* Amend translation of "Subproperty of"
* Add translation of "Subcategory of"
Update RELEASE-NOTES.md

[skip ci]
Update RELEASE-NOTES.md
Update SemanticMediaWiki.php
Update composer.json
Merge pull request #391 from SemanticMediaWiki/I18n

Update SMW_LanguageNb.php
Tidy QueryConditionBuilder
SPARQLStore / Tidy

- Rename SparqlConditionBuilder to QueryConditionBuilder
- Move quey mode logic from SMWSparqlStore to QueryEngine
- Move Store::formatDebugOutput to QueryOutputFormatter::formatDebugOutput
- Remove Store::formatDebugOutput dependency from QueryEngine