Merge branch 'core-80-use-icons-instead-of-plain-text' into 'master'

Use icons instead of plain text. Advances BiscuIT-ng#80.

See merge request BiscuIT/BiscuIT-App-Exlibris!15

biscuit/apps/exlibris/templates/exlibris/add_book.html

@@ -12,7 +12,7 @@
     {% csrf_token %}
     {% bootstrap_form book_add_isbn_form %}
     <button type="submit" class="btn btn-dark">
-      {% blocktrans %}Add{% endblocktrans %}
+      <span class="mdi mdi-plus"></span>
     </button>
   </form>
 {% endblock %}

biscuit/apps/exlibris/templates/exlibris/add_book_copies.html

@@ -13,7 +13,7 @@
     {% csrf_token %}
     {% bootstrap_form bulk_add_form %}
     <button type="submit" class="btn btn-dark">
-      {% blocktrans %}Bulk add{% endblocktrans %}
+      <span class="mdi mdi-plus"></span>
     </button>
   </form>
 {% endblock %}

biscuit/apps/exlibris/templates/exlibris/edit_book.html

@@ -12,7 +12,7 @@
     {% csrf_token %}
     {% bootstrap_form book_edit_form %}
     <button type="submit" class="btn btn-dark">
-      {% blocktrans %}Add / Edit{% endblocktrans %}
+      <span class="mdi mdi-content-save-edit"></span>
     </button>
   </form>
 {% endblock %}

biscuit/apps/exlibris/templates/exlibris/edit_book_copy.html

@@ -12,7 +12,7 @@
     {% csrf_token %}
     {% bootstrap_form book_copy_edit_form %}
     <button type="submit" class="btn btn-dark">
-      {% blocktrans %}Add / Edit{% endblocktrans %}
+      <span class="mdi mdi-content-save-edit"></span>
     </button>
   </form>
 {% endblock %}