diff --git a/homeassistant/components/flick_electric/strings.json b/homeassistant/components/flick_electric/strings.json
index a20b5059ef7..cb8382539b4 100644
--- a/homeassistant/components/flick_electric/strings.json
+++ b/homeassistant/components/flick_electric/strings.json
@@ -6,8 +6,8 @@
         "data": {
           "username": "[%key:common::config_flow::data::username%]",
           "password": "[%key:common::config_flow::data::password%]",
-          "client_id": "Client ID (Optional)",
-          "client_secret": "Client Secret (Optional)"
+          "client_id": "Client ID (optional)",
+          "client_secret": "Client Secret (optional)"
         }
       }
     },
diff --git a/homeassistant/components/nightscout/strings.json b/homeassistant/components/nightscout/strings.json
index 709788c5818..b3b99485587 100644
--- a/homeassistant/components/nightscout/strings.json
+++ b/homeassistant/components/nightscout/strings.json
@@ -3,7 +3,7 @@
         "step": {
             "user": {
                 "title": "Enter your Nightscout server information.",
-                "description": "- URL: the address of your nightscout instance. I.e.: https://myhomeassistant.duckdns.org:5423\n- API Key (Optional): Only use if your instance is protected (auth_default_roles != readable).",
+                "description": "- URL: the address of your nightscout instance. I.e.: https://myhomeassistant.duckdns.org:5423\n- API Key (optional): Only use if your instance is protected (auth_default_roles != readable).",
                 "data": {
                     "url": "[%key:common::config_flow::data::url%]",
                     "api_key": "[%key:common::config_flow::data::api_key%]"
diff --git a/homeassistant/components/plex/strings.json b/homeassistant/components/plex/strings.json
index bfe6375f5ac..c16a84b1cd8 100644
--- a/homeassistant/components/plex/strings.json
+++ b/homeassistant/components/plex/strings.json
@@ -19,7 +19,7 @@
           "port": "[%key:common::config_flow::data::port%]",
           "ssl": "[%key:common::config_flow::data::ssl%]",
           "verify_ssl": "[%key:common::config_flow::data::verify_ssl%]",
-          "token": "Token (Optional)"
+          "token": "Token (optional)"
         }
       },
       "select_server": {
diff --git a/homeassistant/components/tesla/strings.json b/homeassistant/components/tesla/strings.json
index 0f5a7666175..755e5d5a7cf 100644
--- a/homeassistant/components/tesla/strings.json
+++ b/homeassistant/components/tesla/strings.json
@@ -14,7 +14,7 @@
         "data": {
           "username": "[%key:common::config_flow::data::email%]",
           "password": "[%key:common::config_flow::data::password%]",
-          "mfa": "MFA Code (Optional)"
+          "mfa": "MFA Code (optional)"
         },
         "description": "Please enter your information.",
         "title": "Tesla - Configuration"
diff --git a/homeassistant/components/yeelight/strings.json b/homeassistant/components/yeelight/strings.json
index a0ce26550c8..73868b6c571 100644
--- a/homeassistant/components/yeelight/strings.json
+++ b/homeassistant/components/yeelight/strings.json
@@ -30,7 +30,7 @@
       "init": {
         "description": "If you leave model empty, it will be automatically detected.",
         "data": {
-          "model": "Model (Optional)",
+          "model": "Model (optional)",
           "transition": "Transition Time (ms)",
           "use_music_mode": "Enable Music Mode",
           "save_on_change": "Save Status On Change",