UI improvements, Arabic translation, improvements tracing functionality, fix for blucon

• translation to Arabic
• fixes Spanish translations
• fix #98 Blucon ID input field/check inconsistent
• #104 trace file : no need to enable it in the settings, it is enabled by default. There's a maximum of 15 MB stored, which corresponds to around 6 days (depends on how much logs the specific installation is generating). The files are not deleted anymore but can be sent at any time.
• Yellow tint applied to all "+", "Scan" and "Connect" elements
• fix : send the MiaoMiao firmware and hardware to delegate