This new version is a replacement for Existing Easy Accents for Google Docs add-on.

Easily add accent marks to your Google Docs.
New Features:
Default Language
Custom Lists
Math and Logic Marks

Current Supported Languages:
Afrikaans
Ancient Latin - long marks
Catalan
Czech
Danish
Dutch
Esperanto
Finnish
French
German
Hawaiian
Hungarian
Icelandic
Irish
Italian
Latvian
Lithuanian
Māori
Pinyin Tones
Polish
Português
Sámi
Sanskrit
Serbo-Croatian
Spanish

Updates:
03-03-2019 - Fixed Māori default.
01-04-2019 - Custom Lists and Math
12-18-2018 - Code cleanup and optimization.
12-11-2018 - License Updates
12-07-2018 - License code update / typo
11-01-2018 - Updated menu code
06-18-2018 - Code cleanup and optimization. 
05-03-2018 - Code cleanup
01-25-2017 - Added Catalan
10-20-2016 - Removed á from French list.
08-24-2016 - Added Sanskrit
05-04-2016 - Fixed Ŭŭ in Esperanto
03-01-2016 - Added Ȳȳ to Ancient Latin - long marks
02-25-2016 - Added Latvian, Lithuanian, added Euro Symbol, added á to French.
09-18-2015 - Updated French: added Ïï Üü
08-29-2015 - Added Hawaiian.
06-16-2015 - Added Serbo-Croatian.
06-4-2015 - Redesigned UI in order to be compatible with more screen resolutions and browsers.
06-2-2015 - Added menu to sidebar to help with options from add-on menu being cut off, fixed Û in Esperanto.
05-15-2015 - Remove unneeded permission, Code clean-up
04-29-2015 - Added Afrikaans
04-14-2015 - Added Pinyin Tones
03-25-2015 - Added Polish, and fixed some UI issues introduced with iFrame.
03-20-2015 - Added ability for domain wide installation.
03-18-2015 - Fixed Firefox compatibility
03-10-2015 - moved to iFrame sandbox mode as a work-around for chrome v40
03-4-2015 - Added Italian, updated CSS to make accents more legible
03-2-2015 - Added document focus and cursor placement fix, added û to French
02-17-2015 - Added GUILLEMET marks to appropriate languages
01-12-2015 - Added Ancient Latin - long marks
01-9-2015 - Added Português
01-7-2015 - Added 7 new languages: Czech, Danish, Dutch, Esperanto, Finnish, Hungarian and Icelandic
11-30-2014 - Added  ligature of o and e (œ).
11-5-2014 - Updated Layout
11-4-2014 - Added Sámi (Northern, Lule, Southern), auto hide help section, added Êê to French 
11-3-2014 - Added Ââ to French
11-1-2014 - Added Māori
Added the ability to insert capital accents.