Clearing all cached values on query service on reset. Empty string for loading dates.
Refactored and wrote a some tests for empty date formatting.
Added date(time) formatting tests.
Wiki: Increase font size and free space to make it more readable
Wiki: Increase padding around headings
Wiki: Improve list spacing
Wiki: Increase space between paragraphs
Wiki: Reduce line-height a bit
Merge pull request #1402 from opf/feature/prettier_wiki

Wiki: Increase font size and free space to make it more readable
Merge pull request #1419 from opf/feature/clearing-columns-on-query-clear-8756

Clearing all cached values on query service on reset. Empty string for l...
Added required validation to save query modal name.