Thumbnail: Display the same label (recommended ratio) for both URL and UPLOAD.

- Fix i18n concat problem for some languages.
- Display the same label (specifically, the recommended aspect ratio) for both URL and UPLOAD. I think the string "File to upload" can be omitted, but I left it as-is.
- Remove old/unused strings.

static/app-strings.json

@@ -767,8 +767,6 @@
   "You need more Credits to purchase this.": "You need more Credits to purchase this.",
   "Open Rewards": "Open Rewards",
   "Read our %referral_faq_link% to learn more about rewards.": "Read our %referral_faq_link% to learn more about rewards.",
-  "Recommended ratio is 1:1": "Recommended ratio is 1:1",
-  "Recommended ratio is 6.25:1": "Recommended ratio is 6.25:1",
   "Tags Selected": "Tags Selected",
   "After submitting, you will not see the changes immediately. Please check back in a few minutes.": "After submitting, you will not see the changes immediately. Please check back in a few minutes.",
   "You already have a claim with this name.": "You already have a claim with this name.",
@@ -1187,8 +1185,6 @@
   "Cover source": "Cover source",
   "Your changes will be live in a few minutes": "Your changes will be live in a few minutes",
   "Submitting": "Submitting",
-  "Thumbnail Recommended ratio is 1:1": "Thumbnail Recommended ratio is 1:1",
-  "Cover Recommended ratio is 6.25:1": "Cover Recommended ratio is 6.25:1",
   "Old Password": "Old Password",
   "New Password": "New Password",
   "Set Password": "Set Password",
@@ -1225,7 +1221,8 @@
   "Delete Channel": "Delete Channel",
   "Edit Thumbnail Image": "Edit Thumbnail Image",
   "Choose image": "Choose image",
-  "File to upload": "File to upload",
+  "%image_type%  %recommended_ratio%": "%image_type%  %recommended_ratio%",
+  "%label% • File to upload": "%label% • File to upload",
   "Select video file to upload": "Select video file to upload",
   "Uploading...": "Uploading...",
   "Use a URL": "Use a URL",

ui/component/selectAsset/view.jsx

@@ -70,6 +70,17 @@ function SelectAsset(props: Props) {
       });
   }
 
+  // Note for translators: e.g. "Thumbnail  (1:1)"
+  const label = __('%image_type%  %recommended_ratio%', { image_type: assetName, recommended_ratio: recommended });
+
+  let fileSelectorLabel;
+  if (uploadStatus === SPEECH_UPLOADING) {
+    fileSelectorLabel = __('Uploading...');
+  } else {
+    // Include the same label/recommendation for both 'URL' and 'UPLOAD'.
+    fileSelectorLabel = __('%label% • File to upload', { label: label });
+  }
+
   return (
     <Card
       title={title || __('Choose image')}
@@ -81,7 +92,7 @@ function SelectAsset(props: Props) {
               autoFocus
               type={'text'}
               name={'thumbnail'}
-              label={`${assetName}  ${recommended}`}
+              label={label}
               placeholder={'https://example.com/image.png'}
               value={url}
               onChange={e => {
@@ -93,7 +104,7 @@ function SelectAsset(props: Props) {
             <FileSelector
               autoFocus
               disabled={uploadStatus === SPEECH_UPLOADING}
-              label={uploadStatus === SPEECH_UPLOADING ? __('Uploading...') : __('File to upload')}
+              label={fileSelectorLabel}
               name="assetSelector"
               currentPath={pathSelected}
               onFileChosen={file => {