fix: update download button strings (#841)

Resolves #819 

The download buttons should indicate to the use that there is more
information to be discovered. This PR changes the text for single-run
download to `Download...` and the text for single-dataset download to
`Download Dataset...`

<img width="894" alt="Screenshot 2024-07-08 at 12 03 28 PM"
src="https://github.com/chanzuckerberg/cryoet-data-portal/assets/109251328/a68a73e0-86c2-408f-8c9c-d489d1489042">
<img width="896" alt="Screenshot 2024-07-08 at 12 03 38 PM"
src="https://github.com/chanzuckerberg/cryoet-data-portal/assets/109251328/f38d9f41-90f3-4359-9e2f-1e2caa8c2eb3">

frontend/packages/data-portal/app/components/Run/RunHeader.tsx

@@ -83,7 +83,7 @@ export function RunHeader() {
               })
             }
           >
-            {t('downloadRun')}
+            {t('downloadWithAdditionalOptions')}
           </Button>
         </>
       }

frontend/packages/data-portal/public/locales/en/translation.json

@@ -110,12 +110,12 @@
   "downloadAllAnnotations": "Download All Annotations",
   "downloadAllAnnotationsInThisRun": "Download all annotations in this run.",
   "downloadAllRunData": "<semibold>Download all run data via our API.</semibold> <url to='$t(apiDocLink)'>Visit API documentation.</url>",
-  "downloadDataset": "Download Dataset",
+  "downloadDataset": "Download Dataset...",
   "downloadNow": "Download Now",
   "downloadOptions": "Download Options",
-  "downloadRun": "Download Run",
   "downloadTomogram": "Download Tomogram",
   "downloadWillSaveToCurrentDirectory": "Download will save to your current directory. To change save destination, change the current directory in your terminal before continuing.",
+  "downloadWithAdditionalOptions": "Download...",
   "emdb": "EMDB",
   "empiarID": "Empiar ID",
   "energyFilter": "Energy Filter",