Fix spelling

Fixed with:
find . \( -name '*.md' -o -name '*.ui' -o -name '*.html' \) -exec codespell --ignore-words-list=cach,doas,ehr,inout,lits,nd,som,verry --summary --write-changes {} \+
and manual editing.

plugins/feature/satellitetracker/satellitetrackergui.ui

@@ -312,7 +312,7 @@
       <item row="2" column="4">
        <widget class="QDoubleSpinBox" name="longitude">
         <property name="toolTip">
-         <string>Longitude in decimal degress (East positive) of antenna location</string>
+         <string>Longitude in decimal degrees (East positive) of antenna location</string>
         </property>
         <property name="decimals">
          <number>6</number>

plugins/feature/satellitetracker/satellitetrackersettingsdialog.ui

@@ -388,7 +388,7 @@
           <item row="11" column="0">
            <widget class="QCheckBox" name="utc">
             <property name="toolTip">
-             <string>When checked times are dispayed using UTC rather than the local time zone</string>
+             <string>When checked times are displayed using UTC rather than the local time zone</string>
             </property>
             <property name="text">
              <string>Display times in UTC</string>

plugins/feature/startracker/startrackergui.ui

@@ -539,7 +539,7 @@ This can be specified as a decimal (E.g. 34.23) or in degrees, minutes and secon
       <item row="2" column="3">
        <widget class="QDoubleSpinBox" name="longitude">
         <property name="toolTip">
-         <string>Longitude in decimal degress (East positive) of observation point / antenna location</string>
+         <string>Longitude in decimal degrees (East positive) of observation point / antenna location</string>
         </property>
         <property name="decimals">
          <number>6</number>