Change a couple reader accessibility strings to not be terms

They cause problems with our import script (I think because they're
processed first, so the non-term placeholder isn't yet available) and
aren't really necessary.

chrome/locale/en-US/zotero/reader.ftl

@@ -25,23 +25,23 @@ pdfReader-a11yAnnotationPopupAppeared = Use Tab to navigate the annotation popup
 pdfReader-a11yAnnotationCreated = { $type } created.
 pdfReader-a11yAnnotationSelected = { $type } selected.
 
--pdfReader-a11yTextualAnnotationInstruction = To annotate text via the keyboard, first use “{ pdfReader-find-in-document }” to locate the phrase, and then press { general-key-control }-{ option-or-alt }-{ $number } to turn the search result into an annotation.
--pdfReader-a11yAnnotationInstruction = To add this annotation into the document, focus the document and press { general-key-control }-{ option-or-alt }-{ $number }.
+pdfReader-a11yTextualAnnotationInstruction = To annotate text via the keyboard, first use “{ pdfReader-find-in-document }” to locate the phrase, and then press { general-key-control }-{ option-or-alt }-{ $number } to turn the search result into an annotation.
+pdfReader-a11yAnnotationInstruction = To add this annotation into the document, focus the document and press { general-key-control }-{ option-or-alt }-{ $number }.
 
 pdfReader-toolbar-highlight =
-    .aria-description = { -pdfReader-a11yTextualAnnotationInstruction(number: "1")  }
+    .aria-description = { pdfReader-a11yTextualAnnotationInstruction(number: "1")  }
     .title = { pdfReader-underlineText }
 pdfReader-toolbar-underline =
-    .aria-description = { -pdfReader-a11yTextualAnnotationInstruction(number: "2")  }
+    .aria-description = { pdfReader-a11yTextualAnnotationInstruction(number: "2")  }
     .title = { pdfReader-highlightText }
 pdfReader-toolbar-note =
-    .aria-description = { -pdfReader-a11yAnnotationInstruction(number: "3")  }
+    .aria-description = { pdfReader-a11yAnnotationInstruction(number: "3")  }
     .title = { pdfReader-noteAnnotation }
 pdfReader-toolbar-text =
-    .aria-description = { -pdfReader-a11yAnnotationInstruction(number: "4")  }
+    .aria-description = { pdfReader-a11yAnnotationInstruction(number: "4")  }
     .title = { pdfReader-addText }
 pdfReader-toolbar-area =
-    .aria-description = { -pdfReader-a11yAnnotationInstruction(number: "5")  }
+    .aria-description = { pdfReader-a11yAnnotationInstruction(number: "5")  }
     .title = { pdfReader-selectArea }
 pdfReader-toolbar-draw =
     .aria-description = This annotation type cannot be created via the keyboard.

chrome/locale/en-US/zotero/zotero.json

@@ -1046,10 +1046,10 @@
 	"pdfReader-a11yAnnotationSelected": {
 		"string": "{ type } selected."
 	},
-	"-pdfReader-a11yTextualAnnotationInstruction": {
+	"pdfReader-a11yTextualAnnotationInstruction": {
 		"string": "To annotate text via the keyboard, first use “{ pdfReader-find-in-document }” to locate the phrase, and then press { general-key-control }-{ option-or-alt }-{ number } to turn the search result into an annotation."
 	},
-	"-pdfReader-a11yAnnotationInstruction": {
+	"pdfReader-a11yAnnotationInstruction": {
 		"string": "To add this annotation into the document, focus the document and press { general-key-control }-{ option-or-alt }-{ number }."
 	},
 	"pdfReader-toolbar-draw.aria-description": {