template: rename 'farmer id' to 'farm id' and support enter

Term 'farmer' was used in v2 but is now described as 'farm id', this
update this terms

In addition, when hitting enter, the page doesn't reload.

Fixes #16

Author: maxux

templates/boot.ipxe

@@ -18,7 +18,7 @@ echo ===================================
 echo ${reset}
 
 echo Release.....: {{release}}
-echo Farmer......: {{farmerid}}
+echo Farm ID.....: {{farmerid}}
 echo Parameters..: {{parameters}}
 echo 
 

templates/generate.html

@@ -66,13 +66,13 @@ <h1 class="display-3">Zero-OS <span class="text-danger">v3</span> Bootstrapping<
         <h1 class="text-center">Who are you ?</h2>
 
           <p>In order to identify and link the operating system to your farm, you need to set your
-            Farmer ID on the system.<br>
+            Farm ID on the system.<br>
             <a href="https://library.threefold.me/info/manual/#/manual__create_farm" target="_blank">You can find more information here.</a></p>
 
           <div class="alert alert-light boxfill" role="alert">
-            <form>
+            <form onsubmit="return false;">
               <div class="form-group row">
-                <label for="kargs-farmer" class="col-sm-2 col-form-label">Farmer ID</label>
+                <label for="kargs-farmer" class="col-sm-2 col-form-label">Farm ID</label>
                 <div class="input-group col-sm-10">
                   <input type="text" class="form-control" id="farmerid" placeholder="" onkeyup="update_trigger()">
                   <div class="input-group-append">