I will reject this because no sources have been referenced. I'm sure the entry can be improved, but I don't feel Alan's edit is a good 
springboard for that.

>I don't think the romanized "katana" should be in a different sense; they're the same thing.

"(single-edged) sword" includes falchions, sabres, cutlasses, hangers, Messers, dussack, backswords, kopis, all kinds of Dao, shamshir, saif, tulwar, Kilij, shotel etc etc …and also katana, tachi (大刀), tachi (太刀), nodachi/oodachi, nagamaki, kodachi, wakizashi…

So…
Clearly not the same sense.

Not unless you propose making it something like
"(single-edged) sword; katana; wakizashi; tachi; nagamaki; dao; sabre; Messer; falchion; dussack; hanger; backsword; scimitar"
Note that the above list is by no means exhaustive, so there are types missing. Also I used the umbrella term scimitar for all the distinctly different types of Middle Eastern/Indian blades …and using tachi to cover oodachi/nodachi/kodachi as well (as well as 大刀), and the general term Dao, to cover all of the countless different types of single edged Chinese swords
…and yet, it still looks rather preposterously long.

@@ -21,7 +21 @@
-<gloss>(single-edged) sword</gloss>
-<gloss>katana</gloss>
-</sense>
-<sense>
-<pos>&n;</pos>
-<gloss>dagger</gloss>
-<gloss>knife</gloss>
+<gloss>(single-edged) blade (usu. knife/dagger or sword)</gloss>

sense 5 - not a Japanese concept, doesn't need an expl.

@@ -46,2 +46 @@
-<gloss>knife money</gloss>
-<gloss g_type="expl">knife-shaped commodity money used in Zhou dynasty China</gloss>
+<gloss>knife money (knife-shaped commodity money used in ancient China)</gloss>

GG5, etc. Koj, Daijr/s

I don't think the romanized "katana" should be in a different sense; they're the same thing.
I wouldn't mind if "dagger; knife" went into the first sense. They were there originally, but in 2007 Rene split them on the grounds that their usage was "arch" (we might say "hist" now.) Then I dropped the "arch" in 2018.

@@ -22,3 +21,0 @@
-</sense>
-<sense>
-<pos>&n;</pos>

As I have come to understand, JMdict indicates that descriptions separated by a semicolon, within the same sense, indicates that the separated descriptions are different ways of describing the same thing.

Also, shouldn't the senses of "(single-edged) sword" and "dagger; knife" simply be in a single sense of "(single-edged) blade"?
Or "(single-edged) blade; (single-edged) sword; knife; dagger"?

…and when speaking of かたな, in terms of a Japanese sword, is is sometimes used to refer to "Japanese sword", generally, and sometimes as katana (in the English sense of the word. What is known as 打刀, in Japanese), specifically.

Note that neither Japanese, nor Chinese, have the same knife/dagger vs sword distinction, as exists in English.
They merely have terms for blades, distinguishing by number of edges, but not length. (though that distinction has become somewhat blurred, in Japan …after they stopped making double-edged swords or combat knives/daggers, and tool knives are all single edged, aside from a few very specialized exceptions. Hence meaning that the distinction had little practical value anymore, as practically all blades were single edged. Until Modern times, that is)
This leads to a lot of erroneous translations. (arguably _especially_ by Japanese people)

@@ -21,0 +22,3 @@
+</sense>
+<sense>
+<pos>&n;</pos>