Add ability to import/export tagging rules

- Add missing translations
- Add some tests
- Add `/api/taggingrule/export` API endpoint
- Add baggy theme
- Add error message when importing tagging rules failed
- Also fix all translations (I think we are good now)

src/Wallabag/CoreBundle/Resources/translations/messages.ro.yml

@@ -105,6 +105,7 @@ config:
         # login_label: 'Login (can not be changed)'
         name_label: 'Nume'
         email_label: 'E-mail'
+        two_factor:
             # emailTwoFactor_label: 'Using email (receive a code by email)'
             # googleTwoFactor_label: 'Using an OTP app (open the app, like Google Authenticator, Authy or FreeOTP, to get a one time code)'
             # table_method: Method
@@ -139,6 +140,15 @@ config:
         # edit_rule_label: 'edit'
         # rule_label: 'Rule'
         # tags_label: 'Tags'
+        # card:
+        #     new_tagging_rule: Create a tagging rule
+        #     import_tagging_rules: Import tagging rules
+        #     import_tagging_rules_detail: You have to select the JSON file you previously exported.
+        #     export_tagging_rules: Export tagging rules
+        #     export_tagging_rules_detail: This will download a JSON file that you can use to import tagging rules elsewhere or to backup them.
+        # file_label: JSON file
+        # import_submit: Import
+        # export: Export
         # faq:
         #     title: 'FAQ'
         #     tagging_rules_definition_title: 'What does « tagging rules » mean?'
@@ -429,9 +439,9 @@ tag:
     rename:
         # placeholder: 'You can update tag name.'
 
-# export:
-#     footer_template: '<div style="text-align:center;"><p>Produced by wallabag with %method%</p><p>Please open <a href="https://github.com/wallabag/wallabag/issues">an issue</a> if you have trouble with the display of this E-Book on your device.</p></div>'
-#     unknown: 'Unknown'
+export:
+    # footer_template: '<div style="text-align:center;"><p>Produced by wallabag with %method%</p><p>Please open <a href="https://github.com/wallabag/wallabag/issues">an issue</a> if you have trouble with the display of this E-Book on your device.</p></div>'
+    # unknown: 'Unknown'
 
 import:
     # page_title: 'Import'
@@ -601,6 +611,9 @@ flashes:
             # tags_reset: Tags reset
             # entries_reset: Entries reset
             # archived_reset: Archived entries deleted
+            # otp_enabled: Two-factor authentication enabled
+            # tagging_rules_imported: Tagging rules imported
+            # tagging_rules_not_imported: Error while importing tagging rules
     entry:
         notice:
             # entry_already_saved: 'Entry already saved on %date%'