Fix crash when launcher UI fonts are installed system-wide

[andy013]

Issue: #1327

If a user has any of the fonts that are shipped with the launcher installed, it will crash from the second time it is ran onwards.

Memoria/Memoria.Launcher/Resources/Fonts.xaml

Lines 1 to 6 in cf5697d

	<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
	<FontFamily x:Key="CenturyGothic">pack://application:,,,/Fonts/#Century Gothic</FontFamily>
	<FontFamily x:Key="CenturyGothic-Bold">pack://application:,,,/Fonts/centurygothic-bold.ttf</FontFamily>
	<FontFamily x:Key="NotoEmoji">pack://application:,,,/Fonts/#Noto Emoji Regular</FontFamily>
	<FontFamily x:Key="Overpass">pack://application:,,,/Fonts/#Overpass</FontFamily>
	</ResourceDictionary>

If you are trying to recreate this issue, you don't need to install these fonts. You can manually add the name of any of the above fonts to the FontList file.

The first time the launcher is ran the FontList file of installed fonts doesn't exist and so the crash doesn't happen.

If a user has one of the fonts installed, the next time it is ran this code at line 517 will cause the crash:

Memoria/Memoria.Launcher/Launcher/UiGrid.cs

Lines 514 to 520 in cf5697d

	foreach (String value in options)
	{
	if (Lang.Res.Contains(value))
	choices.Add((String)Lang.Res[value]);
	else
	choices.Add(value);
	}

The above code looks to see if there is a specific language string for the combo box values. The crash happens because Lang.Res contains the FontFamily objects of the above 4 fonts. It returns a match and then crashes when cast to a string.

The same problem exists in RefereshComboBoxes although it currently crashes before that can ever throw an error.

I'm not sure what the best way to fix this is but this is my attempt. I created a separate ResourceDictionary just for all the language strings. This way, whenever you lookup a key in Lang.Res you can guarantee it's a string from one of the language files and not another type of resource.

[WarpedEdge]

Hey Andy, have only recently been seeing you around here. Welcome to the community! Great to see another contributor.

[andy013]

@WarpedEdge Thanks! You probably won't see much of me as I'm quite busy with other projects, but I try and help if I can.

[andy013]

It might be better to disable looking for translation strings for font names. With this PR you could still run into an issue where a font has the same name as one of the translation keys and gets translated when it shouldn't be. Font names should never be translated.

Feel free to close this PR if you have a better solution to this. Hopefully it still helped to identify the cause of the crash.