Consistent spelling for "comma-separated" in a message (#834)

The main SemanticMediaWiki extension uses a hyphen,
so this related extension should use it, too.

Also make consistent JSON file indentation.

i18n/en.json

@@ -311,9 +311,9 @@
  "srf-ui-eventcalendar-label-month": "Month",
  "srf-ui-eventcalendar-label-week": "Week",
  "srf-ui-eventcalendar-label-day": "Day",
- "srf-ui-eventcalendar-label-listmonth": "Month (list)",
- "srf-ui-eventcalendar-label-listweek": "Week (list)",
- "srf-ui-eventcalendar-label-listday": "Day (list)",
+ "srf-ui-eventcalendar-label-listmonth": "Month (list)",
+ "srf-ui-eventcalendar-label-listweek": "Week (list)",
+ "srf-ui-eventcalendar-label-listday": "Day (list)",
  "srf-ui-eventcalendar-label-allday": "All day",
  "srf-ui-eventcalendar-format-time": "h(:mm)t",
  "srf-ui-eventcalendar-format-time-agenda": "H:mm( - H:mm)",
@@ -361,7 +361,7 @@
  "srf-paramdesc-spreadsheet-filename": "The filename for the download of the generated spreadsheet file",
  "srf-paramdesc-spreadsheet-fileformat": "The format to be produced for the spreadsheet file. Allowed values: xlsx, xls, ods, csv. Default: xlsx",
  "srf-paramdesc-spreadsheet-templatefile": "The name of a spreadsheet file from the ''File'' namespace used for formatting the generated file",
- "srf-paramdesc-icalendar-timezone": "A comma separated list of timezones",
+ "srf-paramdesc-icalendar-timezone": "A comma-separated list of timezones",
  "srf-paramdesc-gantt-diagramtitle": "Diagram name",
  "srf-paramdesc-gantt-diagramtheme": "Diagram theme",
  "srf-paramdesc-gantt-axisformat": "X-axis: Date format",
@@ -391,7 +391,7 @@
  "srf-printername-samplevariance": "Samplevariance",
  "srf-printername-standarddeviation": "Standarddeviation",
  "srf-printername-variance": "Variance",
- "srf-printername-prolog": "Prolog predicates",
+ "srf-printername-prolog": "Prolog predicates",
  "srf-paramdesc-prolog-filename": "The filename for the download of the generated predicates",
  "srf-paramdesc-prolog-fileformat": "The format to be produced for the predicates file. Allowed values: pl, pro. Default: pl",
  "srf-paramdesc-prolog-pname": "The name of the generated predicates. Default: predicate",