Ten languages, not nine: correct the count everywhere

The picker offers English plus nine translations. I wrote it up as nine
in total with eight unread, which is off by one in the direction that
undercounts the work and, worse, misstates how many catalogues are
waiting for a speaker to read them.

Nine of the ten are machine-made and unread — all of them, not all but
one — so the sentence that matters reads more sharply than the wrong
version did, not less.

FEATURES.md

@@ -631,10 +631,10 @@ Settings **export** to a JSON file and **import** back, and reset to defaults.
 
 ## Interface language
 
-Nine languages, chosen in **Appearance → Language**, and separate from the
-date-and-time locale above. Wanting German dates on an English interface is a
-real preference and so is the reverse, which is why they are two settings and
-not one.
+Ten languages — English and nine translations — chosen in **Appearance →
+Language**, and separate from the date-and-time locale above. Wanting German
+dates on an English interface is a real preference and so is the reverse, which
+is why they are two settings and not one.
 
 | | |
 | --- | --- |
@@ -642,7 +642,7 @@ not one.
 | Deutsch · Español · Français · Nederlands · Português (Brasil) | Beta |
 | Русский · Українська · 简体中文 · 日本語 | Beta |
 
-**Every language but English is marked Beta, and the label is not modesty.**
+**All nine translations are marked Beta, and the label is not modesty.**
 The catalogues were produced by AI against standard dictionaries and have not
 been read by anybody who speaks the language. That is stated in Settings, next
 to a link for reporting anything that reads wrongly, because the alternative —