diff --git a/app/models/translation_override.rb b/app/models/translation_override.rb
index f60b19545c5..77d0b99975d 100644
--- a/app/models/translation_override.rb
+++ b/app/models/translation_override.rb
@@ -27,53 +27,73 @@ class TranslationOverride < ActiveRecord::Base
 
     translation_override = find_or_initialize_by(params)
     params.merge!(data) if translation_override.new_record?
-    i18n_changed if translation_override.update(data)
+    i18n_changed([key]) if translation_override.update(data)
     translation_override
   end
 
   def self.revert!(locale, *keys)
     TranslationOverride.where(locale: locale, translation_key: keys).delete_all
-    i18n_changed
+    i18n_changed(keys)
   end
 
+  def self.i18n_changed(keys)
+    I18n.reload!
+    MessageBus.publish('/i18n-flush', refresh: true)
+
+    keys.each do |key|
+      return if expire_cache(key)
+    end
+  end
+
+  def self.expire_cache(key)
+    if key.starts_with?('post_action_types.')
+      ApplicationSerializer.expire_cache_fragment!("post_action_types_#{I18n.locale}")
+    elsif key.starts_with?('topic_flag_types.')
+      ApplicationSerializer.expire_cache_fragment!("post_action_flag_types_#{I18n.locale}")
+    else
+      return false
+    end
+
+    Site.clear_anon_cache!
+    true
+  end
+
+  private_class_method :i18n_changed
+  private_class_method :expire_cache
+
   private
 
-    def self.i18n_changed
-      I18n.reload!
-      MessageBus.publish('/i18n-flush', refresh: true)
+  def check_interpolation_keys
+    original_text = I18n.overrides_disabled do
+      I18n.backend.send(:lookup, self.locale, self.translation_key)
     end
 
-    def check_interpolation_keys
-      original_text = I18n.overrides_disabled do
-        I18n.backend.send(:lookup, self.locale, self.translation_key)
+    if original_text
+      original_interpolation_keys = I18nInterpolationKeysFinder.find(original_text)
+      new_interpolation_keys = I18nInterpolationKeysFinder.find(value)
+
+      custom_interpolation_keys = []
+
+      CUSTOM_INTERPOLATION_KEYS_WHITELIST.select do |key, value|
+        if self.translation_key.start_with?(key)
+          custom_interpolation_keys = value
+        end
       end
 
-      if original_text
-        original_interpolation_keys = I18nInterpolationKeysFinder.find(original_text)
-        new_interpolation_keys = I18nInterpolationKeysFinder.find(value)
+      invalid_keys = (original_interpolation_keys | new_interpolation_keys) -
+        original_interpolation_keys -
+        custom_interpolation_keys
 
-        custom_interpolation_keys = []
+      if invalid_keys.present?
+        self.errors.add(:base, I18n.t(
+          'activerecord.errors.models.translation_overrides.attributes.value.invalid_interpolation_keys',
+          keys: invalid_keys.join(', ')
+        ))
 
-        CUSTOM_INTERPOLATION_KEYS_WHITELIST.select do |key, value|
-          if self.translation_key.start_with?(key)
-            custom_interpolation_keys = value
-          end
-        end
-
-        invalid_keys = (original_interpolation_keys | new_interpolation_keys) -
-          original_interpolation_keys -
-          custom_interpolation_keys
-
-        if invalid_keys.present?
-          self.errors.add(:base, I18n.t(
-            'activerecord.errors.models.translation_overrides.attributes.value.invalid_interpolation_keys',
-            keys: invalid_keys.join(', ')
-          ))
-
-          return false
-        end
+        return false
       end
     end
+  end
 
 end
 
diff --git a/spec/models/translation_override_spec.rb b/spec/models/translation_override_spec.rb
index 7f31c015a61..c6b214fac5e 100644
--- a/spec/models/translation_override_spec.rb
+++ b/spec/models/translation_override_spec.rb
@@ -54,4 +54,44 @@ describe TranslationOverride do
     expect(ovr.compiled_js).to_not match(/Invalid Format/i)
   end
 
+  context "site cache" do
+    def cached_value(guardian, types_name, name_key, attribute)
+      json = Site.json_for(guardian)
+
+      JSON.parse(json)[types_name]
+        .find { |x| x['name_key'] == name_key }[attribute]
+    end
+
+    shared_examples "resets site text" do
+      it "resets the site cache when translations of post_action_types are changed" do
+        anon_guardian = Guardian.new
+        user_guardian = Guardian.new(Fabricate(:user))
+        original_value = I18n.t(translation_key)
+        types_name, name_key, attribute = translation_key.split('.')
+
+        expect(cached_value(user_guardian, types_name, name_key, attribute)).to eq(original_value)
+        expect(cached_value(anon_guardian, types_name, name_key, attribute)).to eq(original_value)
+
+        TranslationOverride.upsert!('en', translation_key, 'bar')
+        expect(cached_value(user_guardian, types_name, name_key, attribute)).to eq('bar')
+        expect(cached_value(anon_guardian, types_name, name_key, attribute)).to eq('bar')
+
+        TranslationOverride.revert!('en', translation_key)
+        expect(cached_value(user_guardian, types_name, name_key, attribute)).to eq(original_value)
+        expect(cached_value(anon_guardian, types_name, name_key, attribute)).to eq(original_value)
+      end
+    end
+
+    context "post_action_types" do
+      let(:translation_key) { 'post_action_types.off_topic.description' }
+
+      include_examples "resets site text"
+    end
+
+    context "topic_flag_types" do
+      let(:translation_key) { 'topic_flag_types.spam.description' }
+
+      include_examples "resets site text"
+    end
+  end
 end