No item selector views found for image-journal when trying to upload an image passing thru I18nServlet

• Type: Regression Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: Master
• Fix Version/s: 7.1.10 DXP FP25, 7.1.X, 7.2.10 DXP FP14, 7.2.10.5 DXP SP5, 7.2.X, 7.3.7 CE GA8, 7.3.10 DXP FP2, 7.3.X, 7.4.1 CE GA2, 7.4.13 DXP GA1, Master
• Component/s: Core Infrastructure
• Labels:
  • backend_test
  • ee-ts
  • liferay-dxp-72-sp5
  • liferay-fixpack-dxp-14-7210
  • liferay-fixpack-dxp-2-7310
  • liferay-fixpack-dxp-25-7110
• Branch Version/s:
  7.3.x, 7.2.x, 7.1.x
• Backported to Branch:
  Committed
• Fix Priority: 3
• Git Pull Request: https://github.com/shuyangzhou/liferay-portal/pull/10010

Description:
No item selector views found for image-journal when trying to upload an image passing through I18nServlet.java#L244 
Seems that this code is cutting of on the URL and is not being able to open dialogue correctly:

path.substring( friendlyURLSeparatorIndex + friendlyURLSeparator.length())

Original URL:
http://localhost:8080/es/group/guest/~/control_panel/manage/-/select/journal%2Cimage/_com_liferay_journal_web_portlet_JournalPortlet_selectDocumentLibrary?_com_liferay_item_selector_web_portlet_ItemSelectorPortlet_0_json=%7B%22desiredItemSelectorReturnTypes%22%3A%22fileentry%22%2C%22folderId%22%3A%220%22%2C%22resourcePrimKey%22%3A%2240428%22%7D&_com_liferay_item_selector_web_portlet_ItemSelectorPortlet_1_json=%7B%22desiredItemSelectorReturnTypes%22%3A%22fileentry%22%7D&p_p_auth=4NYkTmbw&_undefined_bodyCssClass=dialog-iframe-popup

Redirected URL:
Redirect /group/guest/~/control_panel/manage/-/select/journal,image/_com_liferay_journal_web_portlet_journalportlet_selectdocumentlibrary

Expected URL:
Redirect /group/guest/~/control_panel/manage/-/select/journal-image/_com_liferay_journal_web_portlet_journalportlet_selectdocumentlibrary

In the URL the part "/journal,image/" has a comma and the expected one should be as so, but gets changed with a line as "/journal-image/"

Steps:
1. Go to Content & Data > Web Content > Structures > create new structure by clicking +
2. Add to this structure an image field and upload field
3. Go to Web content and create a new one using the structure created at step 1
4. Having the default language selected as English open the dialogue to upload an image (it should open correctly)
5. Now go to the browser URL and add in front /es/ in order to change the display language from English to Spanish
6. Open again the dialogue to upload an image or file (shouldn't work a dialogue is opened with a message "Selection is not available") 

Actual:  A dialogue is opened with a message "Selection is not available" when adding language in the URL

Expected: A dialogue to upload an image or file in a journal article is opened correctly when adding language in the URL