Support Google Font dependencies

Allow downloading fonts from Google Font at install time.
Closes GitLab issue #595, thanks to Martin (@efelon) for the
report. Closes re-opened GitLab issue #343.
Remove included Lato font.

Signed-off-by: Roberto Rosario <roberto.rosario.gonzalez@gmail.com>

mayan/apps/appearance/dependencies.py

@@ -2,15 +2,31 @@ from __future__ import unicode_literals
 
 from django.utils.translation import ugettext_lazy as _
 
-from mayan.apps.dependencies.classes import JavaScriptDependency
+from mayan.apps.dependencies.classes import (
+    GoogleFontDependency, JavaScriptDependency
+)
 
+GoogleFontDependency(
+    label=_('Lato font'), module=__name__, name='lato',
+    url='https://fonts.googleapis.com/css?family=Lato:400,700,400italic'
+)
 JavaScriptDependency(
     label=_('Bootstrap'), module=__name__, name='bootstrap',
     version_string='=3.4.1'
 )
 JavaScriptDependency(
     label=_('Bootswatch'), module=__name__, name='bootswatch',
-    version_string='=3.4.1'
+    replace_list = [
+        {
+            'filename_pattern': '*.css',
+            'content_patterns': [
+                {
+                    'search': '"https://fonts.googleapis.com/css?family=Lato:400,700,400italic"',
+                    'replace': '../../../google_fonts/lato/import.css',
+                }
+            ]
+        }
+    ], version_string='=3.4.1'
 )
 JavaScriptDependency(
     label=_('Fancybox'), module=__name__, name='@fancyapps/fancybox',

mayan/apps/appearance/static/appearance/css/base.css

@@ -11,44 +11,6 @@
         url('../fonts/IM_Fell_English_SC.ttf') format('truetype');
 }
 
-/* Flatly fonts */
-@font-face {
-    font-family: 'Lato';
-    font-style: normal;
-    font-weight: 400;
-    src:
-        local('Lato Regular'),
-        local('Lato-Regular'),
-        url('../fonts/Lato_400.eot?#iefix') format('embedded-opentype'),
-        url('../fonts/Lato_400.woff') format('woff'),
-        url('../fonts/Lato_400.svg#Lato') format('svg'),
-        url('../fonts/Lato_400.ttf') format('truetype');
-}
-@font-face {
-    font-family: 'Lato';
-    font-style: normal;
-    font-weight: 700;
-    src:
-        local('Lato Bold'),
-        local('Lato-Bold'),
-        url('../fonts/Lato_700.eot?#iefix') format('embedded-opentype'),
-        url('../fonts/Lato_700.woff') format('woff'),
-        url('../fonts/Lato_700.svg#Lato') format('svg'),
-        url('../fonts/Lato_700.ttf') format('truetype');
-}
-@font-face {
-    font-family: 'Lato';
-    font-style: italic;
-    font-weight: 400;
-    src:
-        local('Lato Italic'),
-        local('Lato-Italic'),
-        url('../fonts/Lato_400italic.eot?#iefix') format('embedded-opentype'),
-        url('../fonts/Lato_400italic.woff') format('woff'),
-        url('../fonts/Lato_400italic.svg#Lato') format('svg'),
-        url('../fonts/Lato_400italic.ttf') format('truetype');
-}
-
 body {
     padding-top: 70px;
 }