diff --git a/homeassistant/components/fronius/strings.json b/homeassistant/components/fronius/strings.json
index ccfb88852a8..1eaa612a6e7 100644
--- a/homeassistant/components/fronius/strings.json
+++ b/homeassistant/components/fronius/strings.json
@@ -275,7 +275,7 @@
         "name": "Relative self consumption"
       },
       "capacity_maximum": {
-        "name": "Maximum capacity "
+        "name": "Maximum capacity"
       },
       "capacity_designed": {
         "name": "Designed capacity"
diff --git a/homeassistant/components/hive/strings.json b/homeassistant/components/hive/strings.json
index bd4e95618e4..c8062a64ade 100644
--- a/homeassistant/components/hive/strings.json
+++ b/homeassistant/components/hive/strings.json
@@ -21,7 +21,7 @@
         "data": {
           "device_name": "Device Name"
         },
-        "description": "Enter your Hive configuration ",
+        "description": "Enter your Hive configuration",
         "title": "Hive Configuration."
       },
       "reauth": {
diff --git a/homeassistant/components/husqvarna_automower/strings.json b/homeassistant/components/husqvarna_automower/strings.json
index 2c93c7492cf..f251a8bf5e0 100644
--- a/homeassistant/components/husqvarna_automower/strings.json
+++ b/homeassistant/components/husqvarna_automower/strings.json
@@ -55,7 +55,7 @@
         "name": "Cutting height"
       },
       "my_lawn_cutting_height": {
-        "name": "My lawn cutting height "
+        "name": "My lawn cutting height"
       },
       "work_area_cutting_height": {
         "name": "{work_area} cutting height"
diff --git a/homeassistant/components/madvr/strings.json b/homeassistant/components/madvr/strings.json
index b8d30be23aa..06851efa2c8 100644
--- a/homeassistant/components/madvr/strings.json
+++ b/homeassistant/components/madvr/strings.json
@@ -3,7 +3,7 @@
     "step": {
       "user": {
         "title": "Setup madVR Envy",
-        "description": "Your device needs to be on in order to add the integation. ",
+        "description": "Your device needs to be on in order to add the integation.",
         "data": {
           "host": "[%key:common::config_flow::data::host%]",
           "port": "[%key:common::config_flow::data::port%]"
@@ -15,7 +15,7 @@
       },
       "reconfigure": {
         "title": "Reconfigure madVR Envy",
-        "description": "Your device needs to be on in order to reconfigure the integation. ",
+        "description": "Your device needs to be on in order to reconfigure the integation.",
         "data": {
           "host": "[%key:common::config_flow::data::host%]",
           "port": "[%key:common::config_flow::data::port%]"
diff --git a/homeassistant/components/waze_travel_time/strings.json b/homeassistant/components/waze_travel_time/strings.json
index 6b0b4184af7..507731fc973 100644
--- a/homeassistant/components/waze_travel_time/strings.json
+++ b/homeassistant/components/waze_travel_time/strings.json
@@ -100,7 +100,7 @@
         },
         "avoid_subscription_roads": {
           "name": "[%key:component::waze_travel_time::options::step::init::data::avoid_subscription_roads%]",
-          "description": "Whether to avoid subscription roads. "
+          "description": "Whether to avoid subscription roads."
         }
       }
     }
diff --git a/script/hassfest/translations.py b/script/hassfest/translations.py
index fa12ce626ad..50cfc62b5cf 100644
--- a/script/hassfest/translations.py
+++ b/script/hassfest/translations.py
@@ -131,11 +131,13 @@ def translation_value_validator(value: Any) -> str:
     - prevents strings with single quoted placeholders
     - prevents combined translations
     """
-    value = cv.string_with_no_html(value)
-    value = string_no_single_quoted_placeholders(value)
-    if RE_COMBINED_REFERENCE.search(value):
+    string_value = cv.string_with_no_html(value)
+    string_value = string_no_single_quoted_placeholders(string_value)
+    if RE_COMBINED_REFERENCE.search(string_value):
         raise vol.Invalid("the string should not contain combined translations")
-    return str(value)
+    if string_value != string_value.strip(" "):
+        raise vol.Invalid("the string should not contain leading or trailing spaces")
+    return string_value
 
 
 def string_no_single_quoted_placeholders(value: str) -> str:
diff --git a/tests/components/husqvarna_automower/snapshots/test_number.ambr b/tests/components/husqvarna_automower/snapshots/test_number.ambr
index de8b397f01c..63e42ee5d5c 100644
--- a/tests/components/husqvarna_automower/snapshots/test_number.ambr
+++ b/tests/components/husqvarna_automower/snapshots/test_number.ambr
@@ -195,7 +195,7 @@
     }),
     'original_device_class': None,
     'original_icon': None,
-    'original_name': 'My lawn cutting height ',
+    'original_name': 'My lawn cutting height',
     'platform': 'husqvarna_automower',
     'previous_unique_id': None,
     'supported_features': 0,
@@ -207,7 +207,7 @@
 # name: test_number_snapshot[number.test_mower_1_my_lawn_cutting_height-state]
   StateSnapshot({
     'attributes': ReadOnlyDict({
-      'friendly_name': 'Test Mower 1 My lawn cutting height ',
+      'friendly_name': 'Test Mower 1 My lawn cutting height',
       'max': 100.0,
       'min': 0.0,
       'mode': <NumberMode.AUTO: 'auto'>,