While I'm not sure what you are trying to do with it, it currently isn't in group silkscreen (but that may be fixed by importing it there) and it has pxes in the font sizes (which Fritzing will tend to set to a font size of zero which may be your problem) as in
text
transform="scale(1.0439292,0.95791935)"
id="text3336"
y="6.3333588"
x="-16.01897"
style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:13.3781023px;line-height:125%;font-family:'Droid Sans';-inkscape-font-specification:'Droid Sans, Normal';text-align:start;letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
the "font-size:13.3781023px" needs to change to "font-size:13.3781023" to keep Fritzing happy.
That needs to be done with a text editor as Inkscape will just put it back in when it saves the svg if you try and do it there.