i18n improvement to Deployer.json (#560)

* Updated Mission-Impact in Deployer.json and in csvs/child_trees to match latest

* Add keys to Deployer.json example Issue-123-1

* Update in CSS to fix default darkmode/blackbody

docs/ssvc-calc/Deployer.json

@@ -127,6 +127,7 @@
 	{
 	    "label": "Human Impact",
 	    "decision_type": "complex",
+	    "key": "H",
 	    "children": [
 		{
 		    "label": "Situated Safety Impact"
@@ -326,7 +327,8 @@
 		    "color": "#EA3423"
 		}
 	    ],
-	    "label": "Priority"
+	    "label": "Priority",
+	    "key": "P"
 	} ],
     "decisions_table": [
       {

docs/ssvc-calc/css.css

@@ -185,12 +185,15 @@ span.bold {
     text-decoration: none;
     color: #fefefe;
 }
+.blackbody .top_fixed {
+    background-color: rgba(0,0,0,0.9);
+}
 .top_fixed {
     display:none;
     position:fixed;
     top:10px;
     z-index: 1051;
-    background-color: rgba(0,0,0,0.9);
+    background-color: #f8f8ff;
     height: 100%;
     width:75%;
     padding:12px;