block_formats options not translated if using documented approach

📝 Provide detailed reproduction steps (if any)

https://fiddle.tiny.cloud/Fug3lEC28d/0

1. Set a block_formats option of (exact copy from docs):

Paragraph=p; Heading 1=h1; Heading 2=h2; Heading 3=h3; Heading 4=h4; Heading 5=h5; Heading 6=h6;

1. Set language to German
2. Ensure that the format menubar is present
3. Open the Format menu -> Blocks

✔️ Expected result

All headings translated

❌ Actual result

Only paragraph is translated. Others are not

❓ Possible solution

I believe the following patch will solve the issue:

diff --git a/modules/tinymce/src/themes/silver/main/ts/ui/core/complex/SelectDatasets.ts b/modules/tinymce/src/themes/silver/main/ts/ui/core/complex/SelectDatasets.ts
index 01de005aa2..39a7892112 100644
--- a/modules/tinymce/src/themes/silver/main/ts/ui/core/complex/SelectDatasets.ts
+++ b/modules/tinymce/src/themes/silver/main/ts/ui/core/complex/SelectDatasets.ts
@@ -26,7 +26,7 @@ const process = (rawFormats: string[]): BasicSelectItem[] => Arr.map(rawFormats,
   // Allow text=value block formats
   const values = item.split('=');
   if (values.length > 1) {
-    title = values[0];
+    title = values[0].trim();
     format = values[1];
   }
 

I haven't worked out where to write a unit test for this but happy to provide one.

📃 Other details

• Browser: Any
• OS: Any.
• First affected version: Unsure
• Worked in version: Unsure

Start in modules/tinymce/src/themes/silver/main/ts/ui/core/complex/SelectDatasets.ts and reproduce the issue with the linked TinyMCE fiddle using the documented block_formats value and German language. Verify how block-format labels are parsed and add regression coverage wherever the existing unit tests for this entry point reside. Done means all headings in the Format > Blocks menu are translated, not only Paragraph.