Unit: limit symbol length, change name:string -> description:text

Closes #11
Closes #12

app/views/units/_form.html.erb

@@ -7,8 +7,8 @@
         maxlength: @unit.class.columns_hash['symbol'].limit, autocomplete: "off" %>
     </td>
     <td>
-      <%= form.text_field :name, form: :unit_form, size: 30,
-        maxlength: @unit.class.columns_hash['name'].limit, autocomplete: "off" %>
+      <%= form.text_area :description, form: :unit_form, cols: 30, rows: 1, escape: false,
+        maxlength: @unit.class.columns_hash['description'].limit, autocomplete: "off" %>
     </td>
     <td>
       <% unless @unit.base.nil? %>

app/views/units/_unit.html.erb

@@ -8,7 +8,7 @@
     <%= link_to unit, edit_unit_path(unit), id: dom_id(unit, :edit),
       onclick: 'this.blur();', data: {turbo_stream: true} %>
   </td>
-  <td><%= unit.name %></td>
+  <td><%= unit.description %></td>
   <td class="number"><%= scientifize(unit.multiplier) %></td>
 
   <% if current_user.at_least(:active) %>

app/views/units/index.html.erb

@@ -12,7 +12,7 @@
   <thead>
     <tr>
       <th><%= User.human_attribute_name(:symbol).capitalize %></th>
-      <th><%= User.human_attribute_name(:name).capitalize %></th>
+      <th><%= User.human_attribute_name(:description).capitalize %></th>
       <th><%= User.human_attribute_name(:multiplier).capitalize %></th>
       <% if current_user.at_least(:active) %>
         <th><%= t :actions %></th>