Fix untranslated texts

I've also renamed the key for the settings title so the `<h1>` gets the
`title` key, as done in other sections in the admin.

app/views/admin/settings/_configuration_settings_tab.html.erb

@@ -1,3 +1,3 @@
-<h2><%= t("admin.settings.index.title") %></h2>
+<h2><%= t("admin.settings.index.general") %></h2>
 
 <%= render "settings_table", settings: @configuration_settings, setting_name: "setting", tab: "#tab-configuration" %>

app/views/admin/settings/_filter_subnav.html.erb

@@ -7,7 +7,7 @@
     data-tabs>
   <li class="tabs-title is-active">
     <%= link_to "#tab-configuration" do %>
-      <%= t("admin.settings.index.title") %>
+      <%= t("admin.settings.index.general") %>
     <% end %>
   </li>
 

app/views/admin/settings/index.html.erb

@@ -1,4 +1,4 @@
-<h1>Settings</h1>
+<h1><%= t("admin.settings.index.title") %></h1>
 <div class="tabs-content" data-tabs-content="settings-tabs">
   <%= render "filter_subnav" %>
 

app/views/admin/shared/_columns_selector.html.erb

@@ -1,11 +1,11 @@
 <span class="button columns-selector hollow" id="js-columns-selector" data-cookie="<%= cookie %>" data-default="<%= default.join(",") %>">
   <span class="icon-banner"> </span>
-  <strong>Columns</strong>
+  <strong><%= t("admin.budget_investments.index.columns") %></strong>
 </span>
 
 <div class="hidden columns-selector-wrapper" id="js-columns-selector-wrapper">
   <div class="hidden column-selector-item" id="column_selector_item_template">
     <input type="checkbox" name="column-selector[template]" id="column_selector_template" data-column="template">
-    <label for="column_selector_template">Template</label>
+    <label for="column_selector_template"></label>
   </div>
 </div>