Use Title Case for theme names

app/src/main/res/values/strings.xml

@@ -155,14 +155,14 @@
     <string name="theme_dark">On</string>
     <string name="pref_theme_light">Light theme</string>
     <string name="theme_light_default">Default</string>
-    <string name="theme_light_blue">Light blue</string>
-    <string name="theme_light_strawberrydaiquiri">Strawberry daiquiri</string>
+    <string name="theme_light_blue">Light Blue</string>
+    <string name="theme_light_strawberrydaiquiri">Strawberry Daiquiri</string>
     <string name="pref_theme_dark">Dark theme</string>
     <string name="theme_dark_default">Default</string>
-    <string name="theme_dark_blue">Dark blue</string>
-    <string name="theme_dark_midnightdusk">Midnight dusk</string>
-    <string name="theme_dark_amoled">AMOLED black</string>
-    <string name="theme_dark_amoled_hotpink">Hot pink</string>
+    <string name="theme_dark_blue">Dark Blue</string>
+    <string name="theme_dark_midnightdusk">Midnight Dusk</string>
+    <string name="theme_dark_amoled">AMOLED Black</string>
+    <string name="theme_dark_amoled_hotpink">Hot Pink</string>
     <string name="pref_start_screen">Start screen</string>
     <string name="pref_language">Language</string>
     <string name="system_default">Default</string>