Use `translations_for_select` helper in translation select.
Adds spec for #clipboard_select_tag in admin base helper.
Adds spec for Essence#page
Merge pull request #424 from robinboening/essence_spec

Adds spec for Essence#page
Merge pull request #423 from robinboening/clipboard_select_tag_spec

Adds spec for #clipboard_select_tag in admin base helper.