[css-fonts-4] Spec uses phrase "system fonts" when it means "installed fonts"

#1052

Author: litherum

css-fonts-4/Overview.bs

@@ -541,7 +541,7 @@ at least as dark as its predecessor. Only values between 1 - 999 are valid, and
 	mixture of scripts will sometimes omit specific scripts such as Arabic
 	from the set of glyphs supported in the italic face. User agents
 	should be careful about making <em>character map</em> assumptions across
-	faces when implementing support for <em>system font fallback</em>.
+	faces when implementing support for <em>installed font fallback</em>.
 
 <h3 id="font-size-prop">Font size: the 'font-size' property</h3>
 
@@ -1189,7 +1189,7 @@ at least as dark as its predecessor. Only values between 1 - 999 are valid, and
 
 		<li>For other family names, the user agent attempts to find the
 		family name among fonts defined via <code>@font-face</code> rules and then
-		among available system fonts, matching names with a
+		among available installed fonts, matching names with a
 		<a href="#font-family-casing">case-insensitive comparison</a> as outlined
 		in the section above.
 		On systems containing fonts with multiple localized font family
@@ -1391,7 +1391,7 @@ at least as dark as its predecessor. Only values between 1 - 999 are valid, and
 		<!-- resolution on the above: http://lists.w3.org/Archives/Public/www-style/2012Nov/0292.html -->
 
 		<li>If there are no more font families to be evaluated and no matching
-		face has been found, then the user agent performs a <dfn>system font
+		face has been found, then the user agent performs a <dfn>installed font
 		fallback</dfn> procedure to find the best match for the character to be
 		rendered.  The result of this procedure may vary across user agents.
 		</li>
@@ -1791,7 +1791,7 @@ at least as dark as its predecessor. Only values between 1 - 999 are valid, and
     For: @font-palette-values
     </pre>
 
-    This descriptor defines the font family name that this palette applies to. This palette will only ever be applied to the font with this name. The value of this descriptor matches the definition of the <<family-name>> for the 'font-family' property. This means that only named font families are allowed and rules that including generic or system fonts in the list of font families are syntax errors. If syntax errors occur within the font family list, the entire rule must be ignored.
+    This descriptor defines the font family name that this palette applies to. This palette will only ever be applied to the font with this name. The value of this descriptor matches the definition of the <<family-name>> for the 'font-family' property. This means that only named font families are allowed and rules that including generic or installed fonts in the list of font families are syntax errors. If syntax errors occur within the font family list, the entire rule must be ignored.
 
 	<h3 id="base-palette-desc">Specifying the base palette: the 'base-palette' descriptor</h3>