You are using Fiori Launchpad on S/4HANA Cloud system, if you change the language, the titles of some standard groups cannot be displayed in different languages.
Image/data in this KBA is from SAP internal systems, sample data, or demo systems. Any resemblance to real data is purely coincidental.
SAP S/4HANA Cloud
The groups have been personalized by the end user.
The content delivered by SAP is stored in the configuration scope. At the beginning, the standard groups in personalization scope are all actually loaded from configuration scope. And if you change the language, the titles of the standard groups would be changed accordingly.
However, if you made any changes to a standard group in the personalization scope (Fiori Launchpad), the changes supersede the content stored in configuration scope and then, the group would no longer be a "standard" group. And in this case, when you change the language, the title of the group would not be changed accordingly.
You can check the scope of a group in http trace. Press F12 on the Fiori Launchpad home page and then reload the page and refer to the steps in the following screenshot to check it:
You can reset the groups by editing the home page and then click on the reset button of the groups.
For on premise system, please refer to the following KBA:
2476281 - SAP Fiori Launchpad: Title of a standard group/catalog cannot be displayed in different languages
language, layer, scope, group, PAGE_BUILDER_PERS, mixed, translation, #SAPFiori, #SAPFLP , KBA , CA-FLP-ABA , ABAP Services , CA-FLP-FE-COR , Core (Client) , Problem