Don't use html/markup in strings. Closes #290.

Also fixes the build.

There hasn't been a reply to the issue in months, and there's only one string
using them.

F-Droid/res/values-bg/strings.xml

@@ -206,7 +206,6 @@
   <string name="root_access_denied_title">Root достъпът е отказан</string>
   <string name="update_all">Актуализирай всички</string>
   <string name="system_permission_denied_body">Опцията е налична само когато сте инсталирали F-Droid като системно приложение.</string>
-  <string name="swap_nfc_description">Ако приятелят ви има &lt;b&gt;F-Droid и е включил NFC&lt;/b&gt; можете да докоснете телефоните си.</string>
   <string name="swap_join_same_wifi">Свържете се към една и съща WiFi мрежа с приятеля си.</string>
   <string name="swap_wifi_help">Научете повече относно WiFi</string>
   <string name="menu_swap">Размяна на приложения</string>

F-Droid/res/values/strings.xml

@@ -317,7 +317,7 @@
     <string name="system_uninstall_button">Uninstall</string>
 
     <string name="app_description">F-Droid is an installable catalogue of FOSS (Free and Open Source Software) applications for the Android platform. The client makes it easy to browse, install, and keep track of updates on your device.</string>
-    <string name="swap_nfc_description">If your friend has <b>F-Droid and NFC turned on</b> touch your phones together.</string>
+    <string name="swap_nfc_description">If your friend has F-Droid and NFC turned on touch your phones together.</string>
     <string name="swap_join_same_wifi">Join the same Wifi as your friend</string>
     <string name="swap_join_this_hotspot">Help your friend join your hotspot</string>
     <string name="swap_use_bluetooth">Use Bluetooth instead</string>
@@ -384,4 +384,4 @@
         <item>GiB</item>
         <item>TiB</item>
     </string-array>
-</resources>
+</resources>