Add cells to card and tidy up

src/js/data/copy.json

@@ -137,6 +137,7 @@
       "tags": "Tags",
       "notags": "No known tags for this event.",
       "source": "Source",
+      "unknown_source": "Unknown source. The relability of this event cannot be confirmed.",
       "category": "Category",
       "communication": "Communication",
       "transmitter": "Transmitter",

src/js/utilities.js

@@ -36,6 +36,14 @@ export function isNotNullNorUndefined(variable) {
   return (typeof variable !== 'undefined' && variable !== null);
 }
 
+/*
+* Capitalizes _only_ the first letter of a string
+* Taken from: https://stackoverflow.com/questions/1026069/how-do-i-make-the-first-letter-of-a-string-uppercase-in-javascript
+*/
+export function capitalizeFirstLetter(string) {
+    return string.charAt(0).toUpperCase() + string.slice(1);
+}
+
 /**
 * Return a Date object given a datetime string of the format: "2016-09-10T07:00:00"
 * @param {string} datetime