Change date format to European (DD/MM/YYYY) and add explanation for sats

- Updated date formatting in calculate.js to use 'en-GB' locale for European date format (DD/MM/YYYY)
- Added explanatory text "(smallest unit of Bitcoin)" next to "sats" in the main heading

calculate.js

@@ -80,7 +80,7 @@ module.exports = {
                 year = date.getFullYear();
                 rawsat = hist_entries[v]['sateur_rate']
                 percentage = (-100 * ((rawsat - today_sats) / rawsat)).toFixed(3)
-                final_list.push({ "year": date.toLocaleDateString(), "sats": rawsat.toLocaleString("en-US"), "percent": percentage });
+                final_list.push({ "year": date.toLocaleDateString('en-GB'), "sats": rawsat.toLocaleString("en-US"), "percent": percentage });
             }
             return final_list
         } catch (error) {

views/sats.hbs

@@ -46,7 +46,7 @@
     <div class="container" style="margin-top: 20px;">
         <div class="row">
             <center>
-                <h3> {{ Title }} <span id="current"></span> sats</h3>
+                <h3> {{ Title }} <span id="current"></span> sats <small>(smallest unit of Bitcoin)</small></h3>
             </center>
             <script>
                 var currentPrice = 0;