Help: replaced custom <bold> and <italic> formatting tags with Pango …

…equivalents

[ci skip]

data/core/editor/help.cfg

@@ -141,7 +141,7 @@ Have a look at the addon server for easy to use additional music tracks."
     # generator="contents:editor"
     text= "<img>src=icons/icon-editor.png align=left box=no float=yes</img>" + _ "Wesnoth's Map and Scenario Editor allows users to create and edit the maps on which every Wesnoth scenario takes place. It also provides a limited set of features for setting up a basic scenario.
 
-The editor can be launched from the <italic>text='Map Editor'</italic>" + _ " option at the title screen.
+The editor can be launched from the <i>Map Editor</i>" + _ " option at the title screen.
 
 <header>text='What you get'</header>" + _ "
 
@@ -189,12 +189,12 @@ TODO is that true?
 Allows only the composing of the terrain map itself and the definition of leader starting positions." + _ "
 How the information is saved depends on the loaded file:
 
-<bold>text='Native'</bold>" + _ "
+<b>Native</b>" + _ "
 A new map or file containing only the arguments to the map_data attribute.
 
 The produced map can be played in the “User Maps” game type at the create multiplayer game dialog if saved to the default directory.
 
-<bold>text='Embedded'</bold>" + _ "
+<b>Embedded</b>" + _ "
 Scenario files containing a valid map_data attribute (not a file include) will be opened in this submode. The editor replaces only the content of map_data and leaves everything else in the scenario untouched. Maps opened this way are marked [e] in the Maps menu." + _ "
 
 <header>text='Scenario Mode'</header>" + _ "