src/warning.svg:
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    Author: user:Penubag / Wikimedia Commons / Public Domain

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    License statement:
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    This work has been released into the public domain by its author, penubag.
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src/error.svg:
    Imported on July 11, 2016.

    Author: user:Penubag / Wikimedia Commons / Public Domain

    Downloaded from:
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    License statement:
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    I, the copyright holder of this work, release this work into the public
    domain. This applies worldwide.

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    I grant anyone the right to use this work for any purpose, without any
    conditions, unless such conditions are required by law.