Fix SI and Decimal unit usage

SI: For 1000, it is kB, MB, GB
IEC: For 1024, it is KiB, MiB, GiB

JEDEC: For 1024, it is KB, MB (conflicts with SI, of course)

Ultimately, what we decided is for RAM use IEC and for Disk use SI.
This is what docker does and also suggested here -
https://stackoverflow.com/questions/8632269/displaying-file-size-1000b-1kb-or-1024b-1kb

src/terminal.html

@@ -101,7 +101,7 @@
           <h4 class="modal-title">{{ 'terminal.upload.title' | tr:{ name: selected.name } }}</h4>
         </div>
         <div class="modal-body">
-          <span><b>{{ uploadProgress.current | prettyByteSize }}</b> (total {{ uploadProgress.total | prettyByteSize }})</span>
+          <span><b>{{ uploadProgress.current | prettyDecimalSize }}</b> (total {{ uploadProgress.total | prettyDecimalSize }})</span>
           <div class="progress progress-striped active">
             <div class="progress-bar progress-bar-success" role="progressbar" style="width: {{ 100*(uploadProgress.current/uploadProgress.total) }}%"></div>
           </div>