Fix selecting subscription service

• Fix change event handler for <input type="radio">

Add Japanse translations

• Add messages.json (@NHRD)
• Update translators

Update Spanish translation

Thanks @lisandrodemarchi

Improve setting custom subscription URLs

Do not set absolute paths for custom subscribe URLs

Add custom subscription URL support

• Add ability to hide/require URL inputs bases on subscription resolves #101
• Add Nextcloud News support resolves #97
• Add TinyTinyRss support resolves #100

Fix variety of user-reported issues

• Add ability to open feeds in adjacent tab #94
• Catch & ignore some errors #90
• Update layout of subscription options #96
• Vertically center inputs & icons
• Make ESlint warn on console.* usage #90
• Fix overflow & wrapping of long feed titles #93
• Fix light theme icon color #91

Add generic font options

• Adds serif, sans-serif, & monospace
• Update translators in README

Add Polish translation

Polish translation with correct author (submitted by patch).

Add Inoreader as subscription option

• Update logos submodule with Inoreader
• Add Inoreader to subscription options
• Add Inoreader subscribe handler

Update French localization

Update French strings by @vindarel