Clean up layout-files

- Change text to symbols
- Remove unused button-definitions

This makes these layout-files easier to understand and edit.

Part-of: <https://gitlab.gnome.org/World/Phosh/squeekboard/-/merge_requests/629>

data/keyboards/il.yaml

@@ -11,24 +11,24 @@ views:
         - "' - ק  ר א ט ו ן ם פ"
         - "ש ד ג כ ע י ח ל ך ף"
         - "ז ס ב ה נ מ צ ת ץ  BackSpace"
-        - "show_numbers comma preferences         space        period Return"
+        - "show_numbers CommaLarge preferences         space        . Return"
     numbers:
         - "1 2 3 4 5 6 7 8 9 0"
         - "@ # ₪ % & - _ + ( )"
-        - "show_symbols   , \" ' colon ; ! ?  BackSpace"
-        - "show_letters preferences         space        period Return"
+        - "show_symbols   , \" ' : ; ! ?  BackSpace"
+        - "show_letters preferences         space        . Return"
     symbols:
         - "~ ` | · √ π τ ÷ × ¶"
         - "© ® £ € $ ^ ° * { }"
         - "show_numbers_from_symbols   \\ / < > = [ ]  BackSpace"
-        - "show_letters preferences         space        period Return"
+        - "show_letters preferences         space        . Return"
 
 buttons:
     BackSpace:
         outline: "default"
         icon: "edit-clear-symbolic"
         action: erase
-    comma:
+    CommaLarge:
         outline: "special"
         text: ","
         
@@ -56,9 +56,8 @@ buttons:
             set_view: "symbols"
         outline: "altline"
         label: "*/="
-    period:
+    .:
         outline: "special"
-        text: "."
     space:
         outline: "spaceline"
         text: " "
@@ -66,6 +65,3 @@ buttons:
         outline: "wide"
         icon: "key-enter"
         keysym: "Return"
-    colon:
-        text: ":"
-