Fix proposals suggest feature

Now we need one suggest placeholder for each translation. This also
fixes invalid usage of id HTML attribute.

app/views/proposals/_form.html.erb

@@ -5,7 +5,6 @@
   <%= render "shared/errors", resource: @proposal %>
 
   <div class="row">
-
     <%= f.translatable_fields do |translations_form| %>
       <div class="small-12 column">
         <%= translations_form.text_field :title,
@@ -13,10 +12,10 @@
               placeholder: t("proposals.form.proposal_title"),
               label: t("proposals.form.proposal_title"),
               data: { js_suggest_result: "js_suggest_result",
-                      js_suggest: "#js-suggest",
+                      js_suggest: ".js-suggest",
                       js_url: suggest_proposals_path } %>
       </div>
-      <div id="js-suggest"></div>
+      <div class="js-suggest" data-locale="<%= translations_form.locale %>"></div>
 
       <div class="small-12 column">
         <%= translations_form.label :summary %>

spec/features/proposals_spec.rb

@@ -1727,7 +1727,7 @@ describe "Proposals" do
       fill_in "Proposal title", with: "search"
       check "proposal_terms_of_service"
 
-      within("div#js-suggest") do
+      within("div.js-suggest") do
         expect(page).to have_content "You are seeing 5 of 6 proposals containing the term 'search'"
       end
     end
@@ -1743,7 +1743,7 @@ describe "Proposals" do
       fill_in "Proposal title", with: "debate"
       check "proposal_terms_of_service"
 
-      within("div#js-suggest") do
+      within("div.js-suggest") do
         expect(page).not_to have_content "You are seeing"
       end
     end