Simplify _deep_replace() by removing it's obscure looping and replacement checking logic, and instead, using the PHP5 $count parameter of str_replace(). Props hakre. Fixes #16903

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Remove some PHP4-ness from the antispambot() function, and update it to match some modern coding standards. Props hakre and crrobi01 for initial patches. Fixes #16754

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Check to see if mbstring.func_overload is configured to affect string functions before switching charsets. Props SergeyBiryukov. Fixes #25063

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WP_Filesystem: Use the FTP_* path override constants during upgrades for prefixed paths, ie. use FTP_BASE for ABSPATH/sub-dir as well as just for ABSPATH/. Props vericgar for initial patch. See #14401

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Correct a typo in a docblock in [25055]. Props buffler. See #16754

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Allow for plugin translations to be loaded from WP_LANG_DIR/plugins/$domain-$locale.mo.

props dimadin.
see #18200.


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Twenty Fourteen: change IDs to classes in markup and CSS selectors. Props obenland, see #24858.
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Twenty Fourteen: don't allow line-wrapping in the top-level navigation menu items. Props georgestephanis, fixes #24917.
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Twenty Fourteen: remove `masthead-fixed` class after window returns to top. Props cainm, fixes #25026.
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Twenty Fourteen: ensure toolbar doesn't have a gap at the top when you start scrolling, including back compat for 3.6. Props MikeHansenMe and SergeyBiryukov, fixes #24914.
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Twenty Fourteen: Focus search box on search menu click, props kovshenin for original patch. Fixes #24895.
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Twenty Fourteen: change to just one footer widget area and use Masonry JS to display the widgets in columns. Props Frank Klein, closes #24874.
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Twenty Fourteen: accessibility changes to fix the color contrast ratio in link text and a few other places (notably hovers and focus outlines). Props sabreuse, see #25054.
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Twenty Fourteen: accessibility changes to add focus styles to match the hover style on tag links. Props sabreuse, see #25054.
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Twenty Fourteen: load Genericons correctly, and add comments to other CSS enqueue calls. Props obenland, fixes #25085.
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