I believe that these are actually different things:
wifi-hotspotcould represent any wifi network, or a public 'wifi hotspot'.
wifi-tethering would mainly represent the actual process of tethering, or creating a hotspot.
As such, I don't think they should be merged.
Sorry for short-circuiting your vote, but this seemed pretty clear-cut to me since most of the translation questions were in fact localization questions. I've merged and synonymized.
I think languages is alright to stay separate since it seems like a proper subset of localization, but I'm open to other options.
Unless there's an actual app called "RSS Reader" that will be the source of questions, this seems like a reasonable merger to me.
Although, honestly, the question counts are so low we should just edit them. If the tag resurfaces later then let's create a synonym.
I say no. "Unknown sources" is (should be) about the setting. "Sideloading" is (should be) about the act of installing an app outside of the context of the Market/Play Store/etc.
They are related, sure, but I don't think they're the same.
Thinking about this again, I don't know that a merge is really necessary here. I do think that remote-ussd-attack is a little verbose, and that ussd is sufficient (and can be paired with some other tag like security if needed. At the same time, since these are such incredibly low-traffic tags, a synonym probably won't even matter.
So for now I've just done ...
So most of this already happened at some point (October of last year, it looks like?):
charging is the master for both "charger" and "battery-charging"
power-management is the master for "battery-manager"
The only thing not really covered was the other power-* type tags, but there's another question specifically focusing on that anyway: Tag merge: power, ...