Updating a single item in a single project via the yellow exclamation mark
If you see a yellow exclamation mark 
next to a translation item, in the Translation queue, this means that source content in it has changed. If required, you can update the existing translations in the item, or create a new project with the new content in it, in a copy of that item. If the updated item in the project is sent to multiple target languages, it will be updated for all the target languages at once.
:Select the translation project. To do so, select its name (not the checkbox next to it). Each target language it contains is listed.
Select the required target language. All translation items (translation files) in that target language are listed below the language.
Select the warning symbol
next to the translation item that you want to update. A context menu is displayed for the item.Select the Update option. A Detecting changes in content popup is displayed.
In the popup:
To confirm that you want to update the current item, select Update existing. The changed translations will be returned to Sitecore and update the original translated texts there.
To confirm that you want to create a new translation job from the current item, instead of updating it, select Send as new. If the changed content is sent for translation as a new translation job, and is completed after the original one, the new project will be ignored. No changed translations will be returned to Sitecore. For this reason, we recommend that you cancel the original translation project for changed items, if still possible, before selecting this option.
If you do not want to update this item, select Ignore content updates.
For each option you select, a Check the logs for the current job status popup informs you that the job for processing that option has started. It also lists the selected item.
In the popup, select the Close button.
Result: You return to the Translation queue.