trackball deceleration rate implementation

VoidLink/Localization/Localizable.xcstrings

@@ -1152,6 +1152,29 @@
         }
       }
     },
+    "Deceleration Rate: %.3f  " : {
+      "extractionState" : "manual",
+      "localizations" : {
+        "zh-Hans" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "减速率: %.3f  "
+          }
+        },
+        "zh-Hant" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "减速率: %.3f  "
+          }
+        },
+        "zh-HK" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "减速率: %.3f  "
+          }
+        }
+      }
+    },
     "Delete" : {
       "extractionState" : "manual",
       "localizations" : {