FEATURE: add HTML replacements

This adds support for Watched Words to allow replacement with HTML content rather than always replacing with text.

Can be useful when automatically replacing with the '<abbr>' tag for example.

Discussion - https://meta.discourse.org/t/replace-text-with-more-than-just-links/305672

config/locales/client.en.yml

@@ -4766,7 +4766,7 @@ en:
       clear_filter: "Clear filter"
       no_results:
         title: "No results"
-        description: "We couldn’t find anything matching ‘%{filter}’.<br><br>Did you want to <a class=\"sidebar-additional-filter-settings\" href=\"%{settings_filter_url}\">search site settings</a> or the <a class=\"sidebar-additional-filter-users\" href=\"%{user_list_filter_url}\">admin user list?</a>"
+        description: 'We couldn’t find anything matching ‘%{filter}’.<br><br>Did you want to <a class="sidebar-additional-filter-settings" href="%{settings_filter_url}">search site settings</a> or the <a class="sidebar-additional-filter-users" href="%{user_list_filter_url}">admin user list?</a>'
 
     welcome_topic_banner:
       title: "Create your Welcome Topic"
@@ -6102,6 +6102,7 @@ en:
           one: "show %{count} word"
           other: "show %{count} words"
         case_sensitive: "(case-sensitive)"
+        html: "(html)"
         download: Download
         clear_all: Clear All
         clear_all_confirm: "Are you sure you want to clear all watched words for the %{action} action?"
@@ -6141,6 +6142,8 @@ en:
           upload_successful: "Upload successful. Words have been added."
           case_sensitivity_label: "Is case-sensitive"
           case_sensitivity_description: "Only words with matching character casing"
+          html_label: "HTML"
+          html_description: "Outputs HTML in the replacement"
           words_or_phrases: "words or phrases"
         test:
           button_label: "Test"

config/locales/server.en.yml

@@ -800,6 +800,7 @@ en:
             base:
               invalid_url: "Replacement URL is invalid"
               invalid_tag_list: "Replacement tag list is invalid"
+              invalid_html: "HTML can only be used for replacement"
         sidebar_section_link:
           attributes:
             linkable_type: