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/gr_wide.yaml

@@ -1,4 +1,4 @@
-# Creaed by Sotiris Papadopoulos, sotirios.papadopoulos@inserm.fr
+# Created by Sotiris Papadopoulos, sotirios.papadopoulos@inserm.fr
 ---
 outlines:
     default:   { width: 80,  height: 60 }
@@ -9,30 +9,30 @@ outlines:
 
 views:
     base:
-        - "semicolon ς ε ρ τ υ θ ι ο π"
+        - "; ς ε ρ τ υ θ ι ο π"
         - "α σ δ φ γ η ξ κ λ show_accented"
         - "Shift_L ζ χ ψ ω β ν μ BackSpace"
-        - "show_numbers preferences space period comma Return"
+        - "show_numbers preferences space . CommaSpecial Return"
     upper:
-        - "colon exclam Ε Ρ Τ Υ Θ Ι Ο Π"
+        - ": ! Ε Ρ Τ Υ Θ Ι Ο Π"
         - "Α Σ Δ Φ Γ Η Ξ Κ Λ show_accented"
         - "Shift_L Ζ Χ Ψ Ω Β Ν Μ BackSpace"
-        - "show_numbers preferences space period_upper apostrophe Return"
+        - "show_numbers preferences space ·Special ᾿ Return"
     accented:
         - "ά έ ή ί ϊ ΐ ό ύ ϋ ώ "
         - "Ά Έ Ή Ί Ϊ Ό Ύ Ϋ Ώ show_base"
         - "Ϗ ϐ ϑ ϗ ΰ ϕ ϖ – — BackSpace"
-        - "show_numbers preferences space eis_l eis_r Return"
+        - "show_numbers preferences space « » Return"
     numbers:
         - "1 2 3 4 5 6 7 8 9 0"
-        - "at numbersign dollar percent ampersand minus underscore plus parenleft parenright"
-        - "show_symbols comma quotedbl quoteright colon semicolon exclam question BackSpace"
-        - "show_letters preferences space period comma Return"
+        - "@ # $ % & - _ + ( )"
+        - "show_symbols CommaSpecial \" ' : ; ! ? BackSpace"
+        - "show_letters preferences space . CommaSpecial Return"
     symbols:
-        - "asciitilde quoteleft bar U00B7 squareroot Greek_pi Greek_tau division multiply paragraph"
-        - "copyright U00AE U00A3 EuroSign U00A5 asciicircum degree asterisk braceleft braceright"
-        - "show_numbers backslash slash less greater equal bracketleft bracketright  BackSpace"
-        - "show_letters preferences space period comma Return"
+        - "~ ` | · √ π τ ÷ × ¶"
+        - "© ® £ € ¥ ^ ° * { }"
+        - "show_numbers \\ / < > = [ ]  BackSpace"
+        - "show_letters preferences space . CommaSpecial Return"
 buttons:
     Shift_L:
         action:
@@ -83,122 +83,23 @@ buttons:
         outline: "wide"
         icon: "key-enter"
         keysym: "Return"
-    period:
+    .:
         outline: "special"
-        text: "."
-    period_upper:
+    ·Special:
         outline: "special"
         text: "·"
-    comma:
+    CommaSpecial:
         outline: "special"
         text: ","
-    colon:
+    ":":
         outline: "special"
-        text: ":"
-    semicolon:
+    ;:
         outline: "special"
-        text: ";"
-    apostrophe:
+    ᾿:
         outline: "special"
-        text: "᾿"
-    exclam:
+    "!":
         outline: "special"
-        text: "!"
-    eis_l:
+    «:
         outline: "special"
-        text: "«"
-    eis_r:
+    »:
         outline: "special"
-        text: "»"
-    aring:
-        text: "å"
-    Aring:
-        text: "Å"
-    oslash:
-        text: "ø"
-    Oslash:
-        text: "Ø"
-    ae:
-        text: "æ"
-    AE:
-        text: "Æ"
-    asterisk:
-        text: "*"
-    asciitilde:
-        text: "~"
-    quoteleft:
-        text: "`"
-    bar:
-        text: "|"
-    U00B7:
-        text: "·"
-    squareroot:
-        text: "√"
-    Greek_pi:
-        text: "π"
-    division:
-        text: "÷"
-    multiply:
-        text: "×"
-    paragraph:
-        text: "¶"
-    Greek_tau:
-        text: "τ"
-    copyright:
-        text: "©"
-    numbersign:
-        text: "#"
-    U00AE:
-        text: "®"
-    at:
-        text: "@"
-    dollar:
-        text: "$"
-    U00A3:
-        text: "£"
-    percent:
-        text: "%"
-    EuroSign:
-        text: "€"
-    ampersand:
-        text: "&"
-    U00A5:
-        text: "¥"
-    minus:
-        text: "-"
-    asciicircum:
-        text: "^"
-    underscore:
-        text: "_"
-    degree:
-        text: "°"
-    plus:
-        text: "+"
-    equal:
-        text: "="
-    parenleft:
-        text: "("
-    parenright:
-        text: ")"
-    braceleft:
-        text: "{"
-    braceright:
-        text: "}"
-    backslash:
-        text: "\\"
-    slash:
-        text: "/"
-    quotedbl:
-        text: "\""
-    quoteright:
-        text: "'"
-    less:
-        text: "<"
-    greater:
-        text: ">"
-    question:
-        text: "?"
-    bracketleft:
-        text: "["
-    bracketright:
-        text: "]"