Add required translations-3

Author: kumuditha-udayanga

app/src/main/res/values-si/string.xml

@@ -289,7 +289,7 @@
     <string name="gy">Gy</string>
     <string name="gz">Gz</string>
     <string name="temp">උෂ්ණත්වය</string>
-    <string name="luminosity">ආලෝක තීවෘතාවය</string>
+    <string name="luminosity">ආලෝක තීව්‍රතාවය</string>
     <string name="humidity">ආර්ද්‍රතාවය</string>
     <string name="object_temp">වස්තුවේ උශ්ණත්වය</string>
     <string name="ambient_temp">පරිසර උෂ්ණත්වය</string>
@@ -300,7 +300,7 @@
     <string name="accel_range">Set Accel Range</string>
     <string name="kalman">කාල්මාන් පෙරණය</string>
     <string name="power_up">Power Up</string>
-    <string name="full_spectrum">Full spectrum</string>
+    <string name="full_spectrum">පූර්ණ වර්ණාවලිය</string>
     <string name="infrared">අධෝරක්ත</string>
     <string name="visible">පෙන්වන්න</string>
     <string name="set_gain">Set Gain</string>