Add missing keys to german keyboard

This closes #226

app/src/main/res/xml/keys_letters_german.xml

@@ -38,84 +38,115 @@
         <Key
             app:keyEdgeFlags="left"
             app:keyLabel="q"
+            app:keyWidth="9.05%p"
             app:popupCharacters="1"
             app:popupKeyboard="@xml/keyboard_popup_template"
             app:topSmallNumber="1" />
         <Key
             app:keyLabel="w"
+            app:keyWidth="9.05%p"
             app:popupCharacters="2"
             app:popupKeyboard="@xml/keyboard_popup_template"
             app:topSmallNumber="2" />
         <Key
             app:keyLabel="e"
+            app:keyWidth="9.05%p"
             app:popupCharacters="éè3êëēę"
             app:popupKeyboard="@xml/keyboard_popup_template"
             app:topSmallNumber="3" />
         <Key
             app:keyLabel="r"
+            app:keyWidth="9.05%p"
             app:popupCharacters="ř4ŕ"
             app:popupKeyboard="@xml/keyboard_popup_template"
             app:topSmallNumber="4" />
         <Key
             app:keyLabel="t"
+            app:keyWidth="9.05%p"
             app:popupCharacters="5ť"
             app:popupKeyboard="@xml/keyboard_popup_template"
             app:topSmallNumber="5" />
         <Key
             app:keyLabel="z"
+            app:keyWidth="9.05%p"
             app:popupCharacters="ź6žż"
             app:popupKeyboard="@xml/keyboard_popup_template"
             app:topSmallNumber="6" />
         <Key
             app:keyLabel="u"
+            app:keyWidth="9.05%p"
             app:popupCharacters="űúù7üûū"
             app:popupKeyboard="@xml/keyboard_popup_template"
             app:topSmallNumber="7" />
         <Key
             app:keyLabel="i"
+            app:keyWidth="9.05%p"
             app:popupCharacters="íìî8ïī"
             app:popupKeyboard="@xml/keyboard_popup_template"
             app:topSmallNumber="8" />
         <Key
             app:keyLabel="o"
+            app:keyWidth="9.05%p"
             app:popupCharacters="őóôòõō9ö"
             app:popupKeyboard="@xml/keyboard_popup_template"
             app:topSmallNumber="9" />
         <Key
-            app:keyEdgeFlags="right"
             app:keyLabel="p"
+            app:keyWidth="9.05%p"
             app:popupCharacters="0"
             app:popupKeyboard="@xml/keyboard_popup_template"
             app:topSmallNumber="0" />
+        <Key
+            app:keyEdgeFlags="right"
+            app:keyLabel="ü"
+            app:keyWidth="9.05%p" />
     </Row>
     <Row>
         <Key
-            app:horizontalGap="5%"
             app:keyEdgeFlags="left"
             app:keyLabel="a"
+            app:keyWidth="9.05%p"
             app:popupCharacters="áäàâãåāæą"
             app:popupKeyboard="@xml/keyboard_popup_template" />
         <Key
             app:keyLabel="s"
+            app:keyWidth="9.05%p"
             app:popupCharacters="śßš"
             app:popupKeyboard="@xml/keyboard_popup_template" />
         <Key
             app:keyLabel="d"
+            app:keyWidth="9.05%p"
             app:popupCharacters="ďđ"
             app:popupKeyboard="@xml/keyboard_popup_template" />
         <Key
             app:keyLabel="f"
+            app:keyWidth="9.05%p"
             app:popupCharacters="₣"
             app:popupKeyboard="@xml/keyboard_popup_template" />
-        <Key app:keyLabel="g" />
-        <Key app:keyLabel="h" />
-        <Key app:keyLabel="j" />
-        <Key app:keyLabel="k" />
         <Key
-            app:keyEdgeFlags="right"
+            app:keyLabel="g"
+            app:keyWidth="9.05%p" />
+        <Key
+            app:keyLabel="h"
+            app:keyWidth="9.05%p" />
+        <Key
+            app:keyLabel="j"
+            app:keyWidth="9.05%p" />
+        <Key
+            app:keyLabel="k"
+            app:keyWidth="9.05%p" />
+        <Key
             app:keyLabel="l"
+            app:keyWidth="9.05%p"
             app:popupCharacters="ĺľł"
             app:popupKeyboard="@xml/keyboard_popup_template" />
+        <Key
+            app:keyLabel="ö"
+            app:keyWidth="9.05%p" />
+        <Key
+            app:keyEdgeFlags="right"
+            app:keyLabel="ä"
+            app:keyWidth="9.05%p" />
     </Row>
     <Row>
         <Key
@@ -159,17 +190,17 @@
             app:code="-6"
             app:keyEdgeFlags="left"
             app:keyIcon="@drawable/ic_emoji_emotions_outline_vector"
-            app:secondaryKeyIcon="@drawable/ic_language_outlined"
+            app:keyWidth="10%p"
-            app:keyWidth="10%p" />
+            app:secondaryKeyIcon="@drawable/ic_language_outlined" />
         <Key
             app:code="32"
             app:isRepeatable="true"
             app:keyWidth="40%p" />
         <Key
             app:keyLabel="."
+            app:keyWidth="10%p"
             app:popupCharacters=",?!;:…"
-            app:popupKeyboard="@xml/keyboard_popup_template"
+            app:popupKeyboard="@xml/keyboard_popup_template" />
-            app:keyWidth="10%p" />
         <Key
             app:code="-4"
             app:keyEdgeFlags="right"