Add a badge on locations for new photos

- The last updated date is taken from the latest photo of each location (without any other API call, just some data manipulation)
- Manipulation of data in the preload request instead of the code

src/style/_variables.scss

@@ -2,6 +2,7 @@
 $color-primary: #3C0576;
 $color-primary-darker: #2D0458;
 $color-secondary: #FF6C89;
+$color-secondary-light: #FFB3C2;
 $color-secondary-bright: #FF0536;
 $color-text: #333;
 $color-tertiary: #FFE0C5;